A wаrrantless search of defendant’s airplane disclosed the marijuana on which his convictions were based. Its validity is the only issue on appeal. Our rejection of the district court’s rationale that the airport at which the search occurred was the functional equivalent of the border requires that we examine the authority of the searching Customs agent. Having concluded that, after
United States v. Almeida-Sanchez,
I.
On April 22,1976, Drug Enforcement Administration (DEA) agent Dennis Fitzgerald received a telephone call from Douglas Dufresne, a Pan American World Airways pilot. Dufresne told Fitzgerald that he had information leading him to suspect that John J. Brennan “was going to engage in some smuggling activities into the Melbourne Regional Airport.” Prior to the call, Fitzgerald had had no dealings with Dufresne and had never heard of Brennan.
On April 25, Fitzgerald and another DEA agent met with Dufresne at his residence. At this meeting, Dufresne described Brennan’s plane as a 1969 twin engine Beagle, blue and gold in color, with tail number N569MA, and told the agents that the aircraft was kept in a hangar at the Melbourne Regional Airport. He also recounted a trip to Colombia he had made with Brennan in November 1974, during Which the two of them had been arrested by Colombian police and kept in jail for about a month. After investigation and court proceedings, all charges were dropped, and Brennan and Dufresne were allowed to leave Colombia. Dufresne never disclosed the basis, if any, for the arrest and detention. Finally, Dufresne told the agents he suspected that Brennan would install a 55-gallon auxiliary fuel tank in the Beagle to enable him to make a flight to Colombia and back without refueling and that the purpose of the trip would be to smuggle in 1600 or 1700 pounds of marijuana. Dufresne’s load estimate was based on his own guess as to the plane’s capacity and not on anything Brennan had told him.
On April 28, 1975, Dufresne called Fitzgerald and reported that he had recently talked to Brennan by phone and inferred from the conversation that the smuggling trip would take place within the next two or three weeks. Dufresne stated to Fitzgerald that this inference was based on Brennan’s purchase of the plane and insurance for it in the amount of $95,000 at a time when he, Dufresne, had personal knowledge that Brennan was experiencing great difficulty in meeting the day-to-day living expenses of his family. When Dufresne asked Brennan about his expensive purchase, the latter had replied, “I am just doing my thing.” Brennan had also requested that Dufresne try to locate a second-hand loran — an overwater navigational device suitable for ship or aircraft *714 use. Brennan had said the loran was for “his brother’s boat.”
Fitzgerald confirmed that aircraft N569MA was hangared at the Melbourne Regional Airport. When he contacted the American Embassy in Colombia to investigate the November 1974 arrest of Brennan and Dufresne, he learned that three suspected smugglers, Richard H. Silkie, James King, and Richard Ferrara, had been jailed at the same time, but further investigation failed to establish any relationship between Brennan, Dufresne and the three or what charges had been made against Brennan and Dufresne. The El Paso Intelligence Center was notified to put the tail number of the aircraft into its computer which was used to collect and report possible smuggling-related flight activity.
On May 17, 1975, at approximately 11:00 a. m., Fitzgerald received word that the Beagle aircraft had taken off from Melbourne and was headed in a southwesterly direction. Alleged radar contact with the plane was lost when it entered the air traffic pattern over Miami. 1 Fitzgerald contacted Customs officers headquartered at Tampa, advised them of the Dufresne tips and the flight of N569MA, and requested assistance. An estimated 6 to 7 hours later, two Customs agents, Hays and Miller, were dispatched to the Melbourne airport; they arrived at 5:00 p. m. At approximately 1:30 a. m. on the morning of May 18, the Customs agents sighted a Beagle aircraft moving along the taxiway leading to the hangar normally occupied by the Brennan plane and identified it as N569MA. The plane taxied to the door of the hangar, at which time the agents drove their van to another location near the hangar. During this time, a white male later identified as Brennan exited the hangar and headed toward his nearby automobile. Upon encountering a Melbourne police officer, Brennan headed back toward the hangar, where he was detained by DEA agents. Agent Hays entered the hangar through its partially open door and approached the plane. Observing through the window of the airplane a number of tightly wrapped packages characteristically used to transport marijuana, he decided to conduct a full search of the plane, which disclosed 60 packages of marijuana totaling approximately 1600 pounds and one bundle containing 466 grams of hashish. Following this discovery, Brennan was arrested.
After a hearing at which this testimony was developed, the district court denied the motion to suppress, ruling that the Melbourne airport is the functional equivalent of the border “with regards to those aircraft actually arriving from outside the United States.” The district court characterized the test to be applied to the facts in making the determination of functional equivalency was “whether there was reasonable cause to believe that defendant’s plane did in fact arrive from outside the United States.” Finally, in applying that test, the court found that “[cjonsidering all factors involved, including the information given the government agents by the confidential informant who had been in close contact with the defendant,” reasonable cause existed for such a belief.
II.
This court must first determine whether the district court was correct in deciding that the search took place at the functional equivalent of the border. If so, the agents were entitled to conduct a full search for contraband without particularized knowledge of what Brennan or his plane was carrying.
Almeida-Sanchez v.
*715
United States,
In writing for the court, Justice Stewаrt did not define the “functional equivalent” phrase; instead he gave illustrative examples:
For example, searches at an established station near the border, at a point marking the confluence of two or more roads that extend from the border, might be functional equivalents of border searches. For another example, a search of the passengers and cargo of an airplane arriving at a St. Louis airport after a nonstop flight from Mexico City would clearly be the functional equivalent of a border search.
United States v. Almeida-Sanchez, supra,
The Melbourne Regional Airport was not the functional equivalent of the border when Brennan’s plane landed and taxied into its hangar. Two factors lead us to this conclusion. First, international flights make up only a small percentage of the traffic at the airport, and there was no attempt by airport officials to screen and separate international flights at takeoff and landing.
3
While it is true that a nonstop flight arriving from outside the country “brings the border with it,” the facts here do not furnish any reliable indication that Brennan’s flight was international. He filed no flight plan and his only known direction of travel led toward a metropolitan center in south Florida. The assumed international origin, which was crucial in Justice Stewart’s nonstop flight example, is simply too attenuated here to support this search as one occurring at a functional equivalent of an international border. Secоnd, the regularity factor emphasized in
United States v.
Martinez-Fuerte, -U.S. -,
III.
Thus, the next question is whether the Customs officials involved, because of their status, possessed the authority to search Brennan’s plane for contraband at the Melbourne airport without probable cause or a warrant.
This portion of our review must confront the question reserved in
United States v. Freund,
In
Soria
this court distinguished Customs searches from Border Patrol searches during the period prior to June 21, 1973, the effective date of
Almeida-Sanchez.
However, the panel acknowledged that the principal grounds for distinction were the non-retroactive effect assigned to
Almeida-Sanchez
coupled with the statutory and regulatory roles assigned to the Customs and Border Patrol agencies.
Pre-Almeida-Sanchez
searches by Border Patrol agents were governed by statutes, regulations and decisions granting immigration officials (mfettered discretion to search any vehicle for aliens within the 100-mile radius of the border.
United States v. Soria, supra,
Customs searches have a longer history than Border Patrol activities. The First Circuit noted in construing the predecessor of the present Customs search statute,
5
that
*717
laws conferring the right to search persons and vessels at or near international boundaries have existed since the foundation of the government.
See Lee v. United States,
As the number of customs and immigration violations increased, single officers were empowered to investigate both types of crime. In 1959, this court first decided a case involving one of these two-hatted agents, calling the search a “border search,” and citing both immigration search and customs search cases.
See United States
v.
Ramirez,
Almeida-Sanchez
required probable cause for searches by roving patrols in the vicinity of the border.
See
When an officer’s observations lead him reasonably to suspect that a particular vehicle may contain aliens who are illegally in the country, he may stop the car briefly and investigate the circumstances that provoke suspicion. As in [Terry v. Ohio,392 U.S. 1 ,88 S.Ct. 1868 ,20 L.Ed.2d 899 (1968)], the stop and inquiry must be “reasonably related in scope to the justification for their initiation.”
The officеr may question the driver and passengers about their citizenship and immigration status, and he may ask them to explain suspicious circumstances, but any further detention or search must be based on consent or probable cause.
Then, in
United States v. MartinezFuerte, supra,
the Court' held that a brief investigatory stop could be conducted at a reasonably located checkpoint in the absence of any individualized suspicion. - U.S. at-,
The singular characteristic of the Border Patrol cases is that the Supreme Court has chosen in each instance to strike its own balance of Fourth Amendment “reasonableness,” without regard to the express terms of 8 U.S.C. § 1357. The Court has not relied on the statute or its implementing regulation, despite its language empowering Border Patrol agents to make warrant-less seаrches and arrests within a reasonable distance of the border and the definition of that distance as 100 air miles. At most, the Court has indicated that the statute identified a potential governmental interest to be balanced against individual rights and affirmed the government’s intent to act to protect that interest. 9
With this historical perspective, then, three factors persuade us that
AlmeidaSanchez
applies equally to Customs and Border Patrol searches. The first is the common origin of immigration search case law and customs search case law in the
Carroll
dicta relating to international boundaries.
See Carroll v. United States, supra,
The second additional factor, which should be considered in conjunction with the first, is the accompanying governmental interest in judicial economy. In view of the substantial similarities between the government interests to be protected and the consequences to innocent members of the public if the probable cause barrier is lowered, we do not believe the Supreme Court would have created today’s intricate analytical structure for Border Patrol cases only. Third, we note that other circuits have assumed, usually without explicit discussion, the applicability of Almeida-Sanchez concepts to searches by Customs officials. 10
In sum, regardless of the officers’ status, warrantless searches such as Brennan’s must be made on probable cause.
IV.
Since the search did not take place at the functional equivalent of the border and the officers making the search are entitled to no special status under Almeida-Sanchez, we must inquirers to the existence of probable cause to search. We conclude that, through a combination of hearsay information from the tip, preflight corroboration of some of the details, and the on-the-scene corroboration of Brennan’s surreptitious *720 landing at the predicted time and place, such probable cause in fact did exist.
It is settled law that warrantless searches require the same investigative basis in fact or reasonable conjecture as searches under warrant.
See Carroll v. United States,
Neither Dufresne nor his tip met the
Aguilar
standards for informant credibility or informational reliability, even if the modified standards for first-time informants are employed.
See United States v. Bell,
Similarly, the advance investigation conducted by DEA officials failed to corroborate enough of the significant details of Dufresne’s story to comply with the
Spinelli
formula for curing deficient tips. The fact of Brennan’s ownership of a Beagle aircraft, even with the addition of information as to a particular identifying number, is patently insufficient to justify a search; this is precisely the type of innocent detail held to be of insufficient corroborative value in
Spinelli
itself.
See
Of course, the inability to amass corroborating detail had two effects. One effect was to render it highly unlikely that a valid warrant could have been obtained in advance of May 18. A second and reciprocal effect was to require the additional investigation of Brennan’s activities that led the DEA and Custоms officials to be on the scene at the Melbourne airport on the morning of May 18. At the point at which the law enforcement officials detected the Beagle aircraft proceeding down the taxiway in the dark with its lights off, at a time almost exactly that predicted by Dufresne in his estimate for the time required for a smuggling flight, the quantum-of-knowledge ring closed around Brennan in the manner approved by the Supreme Court in
Draper
v.
United States,
In cases where searches are made without warrants, the Supreme Court has decreed that the existence of probable cause must be accompanied by circumstances rendering the warrant procedure impracticable.
Warden v. Hayden,
stopped and searched any time after probable cause was generated,
i. e.,
as soon as it was identified on the taxiway. However, an attempt by the agents on the scene to have surrounded the plane on the taxiway might have resulted in alerting Brennan or in injury to the officers or others present at the airport. Accordingly, we do not believe that it was a violation of Brennan’s Fourth Amendment rights to allow the chances of escape or armed confrontation with the officers to decrease by permitting him to proceed to his hangar. Further, in a very real sense, this case is analogous to
Chambers v. Maroney,
AFFIRMED.
Notes
. At the suppression hearing, Brennan and the Government clashed sharply over the source of the information that the aircraft was actually in flight. Brennan claimed that there was no confirmation that Fitzgerald’s order to Agent Wingfield to have the plane’s tail number put into the El Paso computer had been carried out and that evеn if it had been, the information Fitzgerald received May 17, involved multiple hearsay problems. Despite considerable wrangling over these questions at the suppression hearing, on appeal both sides appear to treat them as questions of the degree of reliability of the information Fitzgerald and his team possessed at that time. The trial court made no explicit factfindings on either the loading of the computer or the tracking of N569MA, if any, on the morning of May 17.
.
See United States v. Martinez-Fuerte,
- U.S. -,-,
. Customs inspector Joseph Birnbaum testified at the suppression hearing that 23 international flights landed at Melbourne Regional Airport in May, 1975, and that the total number of international flights for a period from May 1, 1974 to May 3, 1975 was 303, or slightly less than one per day. However, the statistics are compiled from voluntary pilot reports and are not subject to any verification procedures.
.
Bowen v. United States,
. Search of vehicles and persons
Any of the officers or persons authorized to board or search vessels may stop, search, and examine, as well without as within their respective districts, any vehicle, beast, or person, on which or whom he or they shall suspect there is merchandise which is subject to duty, or shall have been introduced into the United States in any manner contrary to law, whether by the person in possession or charge, or by, in, or upon such vehicle or beast, or otherwise, and to search any trunk оr envelope, wherever found, in which he may have a reasonable cause to suspect there is merchandise which was imported contrary to law; and if any such officer or other person so authorized shall find any merchandise on or about any such vehicle, *717 beast, or person, or in any such trunk or envelope, which he shall have reasonable cause to believe is subject to duty, or to have been unlawfully introduced into the United States, whether by the person in possession or charge, or by, in, or upon such vehicle, beast, or otherwise, he shall seize and secure the same for trial.
19 U.S.C. § 482 (1970). See also 19 U.S.C. §§ 1481-82 (1970).
. Powers of immigration officers and employees — Powers without warrant
(a) Any officer or employee of the Service authorized under regulations prescribed by the Attorney General shall have power without warrant—
(1) to interrogate any alien or person believed to be an alien as to his right to be or to remain in the United States;
(2) to arrest any alien who in his presence or view is entering or attempting to enter the United States in violation of any law or regulation made in pursuance of law regulating the admission, exclusion, or expulsion of aliens, or to arrest any alien in the United States, if he has reason to believe that the alién so arrested is in the United States in violation of any such law or regulation and is likely to escape before a warrant can be obtained for his arrest, but the alien arrested shall be taken without unnecessary delay for examination before an officer of the Service having authority to examine aliens as to their right to enter or remain in the United States.
(3) within a reasonable distance from any external boundary of the United States, to board and search for aliens any vessel within the territorial waters of the United States and any railway car, aircraft, conveyance, or vehicle, and within a distance of twenty-five miles from any such external boundary to have access to private lands, but- not dwellings, for the purpose of patrolling the border to prevent the illegal entry of aliens into the United States; and
(4) to make arrests for felonies which have been committed and which are cognizable under any law of the United States regulating the admission, exclusion, or expulsion of aliens, if he has reason to believe that the person so arrested is guilty of such felony and if there is likelihood of the person escaping before a warrant can be obtained for his arrest, but the person arrested shall be taken without unnecessary delay before the nearest available officer empowered to commit persons charged with offenses against the laws of the United Stаtes. Any such employee shall also have the power to execute any warrant or other process issued by any officer under any law regulating the admission, exclusion, or expulsion of aliens.
Search without warrant
(c) Any officer or employee of the Service authorized and designated under regulations prescribed by the Attorney General, whether individually or as one of a class, shall have power to conduct a search, without warrant, of the person, and of the personal effects in the possession of any person seeking admission to the United States, concerning whom such officer or employee may have reasonable cause to suspect that grounds exist for exclusion from the United States under this chapter which would be disclosed by such search.
8 U.S.C. § 1357 (1970) formerly 8 U.S.C. § 110 (1946). The Immigration and Nationality Act of 1924, Act of May 26, 1924, 43 Stat. 153, was amended three times to provide gradually expanded arrest and search powers to immigration officers. See Act of February 27, 1925, ch. 364, tit. IV, 43 Stat. 1049 (establishing border and shore patrol, appropriating funds, and giving arrest and search power in border zone); Act of August 7, 1946, ch. 768, 60 Stat. 865 (adding power to arrest for crimes related to illegal immigration where officers have “reason to believe” such violations are occurring); Act of March 20, 1952, ch. 108, § 2, 66 Stat. 26 (adding power to search private lands, but not dwellings, within 25 miles of border). Old § 110 was repealed and replaced by § 1357 in 1952 without comment by the recommending committee. See 1952 — 1 U.S.Code Cong. & Admin. News p. 1653 (1952).
.
Compare United States v. Saldana,
.
Almeida-Sanchez v. United States,
. The circumstance of nonreliance is telling, because the language of the reasonable suspicion/border nexus test draws its quantum-of-knowledge standard from the language of the Customs search statute. On its face, the Customs search statute provides no spatial limitation on the search power. The “border nexus” portion of the test is a later judicial gloss designed to save the statute from patent unconstitutionality.
See, e. g., United States v. Rembert,
.
See, e. g., United States v. Solmes,
.
Compare United States v. Larkin,
