OPINION OF THE COURT
While receiving a massage treatment at a Barbados hotel, appellant Patrick J. O’Connor slipped, fell, and injured his shoulder. He and the hotel had arranged for that massage by telephone after the hotel mailed a spa brochure to his Pennsylvania home. Mr. O’Connor and his wife Marie brought negligence claims against the hotel, and the District Court dismissed for want of personal jurisdiction. In this appeal, we conclude that the District Court had specific jurisdiction to adjudicate the O’Connors’ claims. As a result, we will reverse and remand.
I.
Appellee Sandy Lane Hotel Company is a Barbados corporation. Its sole business is the operation of the Sandy Lane Hotel in St. James, Barbados. The hotel considers itself “the premier address in the Caribbean,” and its features include 45 holes of championship golf, a state-of-the-art spa, and a setting “overlooking a gorgeous crescent of beach on Barbados’ western coast.” Appendix (“App.”) 259, 276.
Patrick and Marie O’Connor reside in Pennsylvania. They first heard about Sandy Lane while planning a vacation. 1 Friends and travel agents said good things about the resort, so the couple booked a week’s stay through the American Express travel agency. The O’Connors left for Barbados in late February 2002 and returned to Pennsylvania in early March. Upon their return, Sandy Lane started mailing seasonal newsletters to the O’Connors’ home. These newsletters kept the O’Connors up to date on new amenities and other changes at Sandy Lane. See, e.g., App. 304 (“[0]ur wine waiters have been in France this summer participating in the harvest and improving their wine knowledge to better serve you.”).
*316 In early 2003, the O’Connors decided to make a return trip. They booked a five-night stay at Sandy Lane through a travel agency. Sandy Lane then mailed the O’Connors a brochure highlighting the many treatments available at the on-site spa. The brochure advised the couple to schedule spa treatments in advance of their trip. The O’Connors perused the brochure and liked what they saw. They decided to purchase various treatments, and the scheduling process involved a series of phone calls both to and from Sandy Lane. In the end, Sandy Lane agreed to provide spa treatments at specific dates and times, and the O’Connors agreed to pay a set price.
The O’Connors arrived in Barbados shortly thereafter, and, on February 26, Mr. O’Connor was due for one of his massages. He went to the spa at the appointed time, and the staff began to “rejuvenate” his “mind, body, and spirit.” App. 281, 325. As part of that process, a Sandy Lane employee instructed Mr. O’Connor to step into the shower and wash up. Unfortunately, Mr. O’Connor’s feet were still slick with massage oils, and there were no mats on the shower’s wet floor. As he stepped into the shower, Mr. O’Connor slipped, fell, and tore his rotator cuff.
Mr. and Mrs. O’Connor brought negligence claims against the hotel in the Court of Common Pleas for Philadelphia County. Sandy Lane removed the case to the United States District Court for the Eastern District of Pennsylvania, and the District Court dismissed for lack of personal jurisdiction. The O’Connors appeal.
II.
The District Court had subject-matter jurisdiction because the O’Connors are citizens of Pennsylvania, Sandy Lane is a Barbados corporation, and the amount in controversy exceeds $75,000.
See
28 U.S.C. §§ 1332, 1441;
Nat’l S.S. Co. v. Tugman,
Once challenged, the plaintiff bears the burden of establishing personal jurisdiction.
General Elec. Co. v. Deutz AG,
Under Federal Rule of Civil Procedure 4(k), a District Court typically exercises personal jurisdiction according to the law of the state where it sits.
See
Fed. R.Civ.P. 4(k)(l)(A). Because this case comes to us from the United States District Court for the Eastern District of Pennsylvania, we apply the Pennsylvania long-arm statute. It provides for jurisdiction “based on the most minimum contact with th[e] Commonwealth allowed under the Constitution of the United States.” 42 Pa. Cons.Stat. Ann. § 5322(b);
see Mellon Bank (East) PSFS, Nat’l Ass’n v. Farino,
III.
The two types of personal jurisdiction are general jurisdiction and specific jurisdiction.
See Helicópteros Nacionales de Colombia, S.A. v. Hall,
The inquiry as to whether specific jurisdiction exists has three parts. First, the defendant must have “purposefully directed [its] activities” at the forum.
Burger King Corp. v. Rudzewicz,
A.
At the threshold, the defendant must have “purposefully availed] itself of the privilege of conducting activities within the forum.”
Hanson v. Denckla,
Some of the contacts alleged by the O’Connors do not meet this standard.
3
First, the O’Connors claim they heard about the hotel from friends and
*318
travel agents in Pennsylvania. Sandy Lane, however, was not a party to these conversations, and they have no bearing on our jurisdictional inquiry.
See Hanson,
Nonetheless, Sandy Lane’s other claim-specific contacts do amount to purposeful availment. After the O’Connors’ initial stay, Sandy Lane continued to cultivate the relationship by mailing seasonal newsletters to their Pennsylvania home. And after the O’Connors booked their 2003 trip, Sandy Lane mailed them a brochure and traded phone calls with them for the purpose of forming an agreement to render spa services. Through these acts, Sandy Lane deliberately reached into Pennsylvania to target two of its citizens.
See Hanson,
B.
1.
Identifying some purposeful contact with the forum is but the first step in the specific-jurisdiction analysis. The plaintiffs’ claims must also “arise out of or relate to” at least one of those contacts.
Helicópteros,
Three approaches predominate. The most restrictive standard is the “proximate cause” or “substantive relevance” test. Courts have articulated this test in a variety of ways. Some hold the defendant’s contacts must be the “legal cause” of the plaintiffs injury “(i.e., the defendant’s instate conduct [must] g[i]ve birth to the cause of action).”
See, e.g., Mass. Sch. of Law at Andover, Inc. v. Am. Bar Ass’n,
A second, more relaxed test requires only “but-for” causation. As the name indicates, this standard is satisfied when the plaintiffs claim would not have arisen
in
the absence of the defendant’s contacts.
See, e.g., Shute v. Carnival Cruise Lines,
A third standard looks for a “substantial connection” or “discernible relationship.” Unlike the but-for test, causation is of no special importance. The critical question is whether the tie between the defendant’s contacts and the plaintiffs claim is close enough to make jurisdiction fair and reasonable.
See Shoppers Food Warehouse v. Moreno,
2.
This Court has never adopted a definitive approach to the relatedness requirement.
9
Over the years, we have applied the requirement many times, but our cases have avoided “categorical determinations.”
See, e.g., Mellon Bank,
We agree, of course, that courts must decide each case individually, and
Miller Yacht’s,
rejection of the proximate cause test binds this panel.
See Blair v. Scott Specialty Gases,
*321
That is not to say, however, that our relatedness inquiry should be completely devoid of standards. The Due Process Clause is supposed to bring “a degree of predictability to the legal system.”
See World-Wide Volkswagen Corp. v. Wood-son,
At the outset, then, we must state that the “sliding scale,” “substantial connection,” and “discernible relationship” tests are not the law in this circuit. By any name, these “hybrid” approaches allow courts to vary the scope of the relatedness requirement according to the “quantity and quality” of the defendant’s contacts.
See
Richman,
supra,
72 Cal. L.Rev. at 1345;
see also Chew,
We are not inclined to alter this approach, nor will we supplement it with a sliding scale. When courts confine general and specific jurisdiction to their separate spheres, potential defendants can anticipate and control their jurisdictional exposure.
See World-Wide,
Unlike the hybrid approaches, the but-for test at least makes an attempt to preserve the distinction between general and specific jurisdiction.
See Shute,
But although the analysis may begin with but-for causation, it cannot end there. The animating principle behind the relatedness requirement is the notion of a tacit quid pro quo that makes litigation in the forum reasonably foreseeable.
See Burger King,
Indeed, even courts that embrace the but-for test recognize its overinclusiveness.
See, e.g., Shute,
We thus hold that specific jurisdiction requires a closer and more direct causal connection than that provided by the but-for test. .As we stated in
Miller Yacht,
there is no “specific rule” susceptible to mechanical application in every case.
See
3.
Applying these principles to this case, we first note that Sandy Lane’s Pennsylvania contacts are a but-for cause of Mr. O’Connor’s ihjury. Mr. O’Connor’s affidavit claims that he decided to purchase spa treatments “as a result” of Sandy Lane’s solicitation. App. 281. We accept that statement as true because the District Court held no evidentiary hearing.
See Miller Yacht,
The link is also much closer than mere but-for causation. Pennsylvania law allows individuals and businesses to make and enforce binding agreements. Sandy Lane availed itself of that opportunity, and, through its mailings and phone calls to Pennsylvania, it formed a contract for spa services. The hotel acquired certain rights under that contract, and with those rights came accompanying obligations. Like all services contracts, the spa agreement contained an implied promise that Sandy Lane would “exercise due care in performing the services required.” See Richard A. Lord, 23 Williston on Contracts § 63.25, at 525-26 (4th ed.2002). In the case before us, the O’Connors contend that Sandy Lane failed to do exactly that. As such, their claims directly and closely relate to a continuing contractual obligation that arose in Pennsylvania.
True enough, the O’Connors’ claims sound in tort, not contract. They claim that Sandy Lane breached a social duty
*324
that existed independent of and in addition to the hotel’s contractual obligations.
See St. Clair v. B & L Paving Co.,
C.
Having determined that minimum contacts exist, we next consider whether the exercise of jurisdiction would otherwise comport with “traditional notions of fair play and substantial justice.”
See Int’l Shoe,
The Supreme Court has identified several factors that courts should consider when balancing jurisdictional reasonableness. Among them are “the burden on the defendant, the forum State’s interest in adjudicating the dispute, the plaintiffs interest in obtaining convenient and effective relief, the interstate [and international] judicial system’s interest in obtaining the most efficient resolution of controversies,”
Burger King,
Several of these factors weigh in favor of litigating this dispute in Barbados. First, the burden on the defendant is a “primary concern” in any case,
see World-Wide,
Sandy Lane, though, has a much higher hill to climb. Because it has minimum contacts with Pennsylvania under the first two steps of our analysis, it must make a “compelling case” that litigation in Pennsylvania would be unreasonable and unfair.
See Burger King,
In light of these countervailing interests, we conclude that this is not one of those “rare” and “compelling” cases where jurisdiction would be unreasonable despite the presence of minimum contacts. The burdens on Sandy Lane are substantial, but they do not entirely dwarf the interests of the O’Connors and the forum state. Pennsylvania may not be the best forum— it may not even be a convenient one.
14
But when minimum contacts exist, due process demands no more than a reasonable forum. Sandy Lane has failed to present a compelling case of unreasonableness, so we hold that jurisdiction in Pennsylvania “comport[s] with fair play and substantial justice.”
See Burger King,
IV.
In sum, the O’Connors have alleged facts that, if true, establish personal jurisdiction over Sandy Lane in Pennsylvania. Sandy Lane purposefully directed its activities at Pennsylvania, the O’Connors’ claims arise from or relate to those activities, and no other factors render jurisdiction in Pennsylvania unfair or unreasonable. The District Court therefore had specific jurisdiction to adjudicate the O’Connors’ claims. We will reverse its judgment and remand the case for further proceedings.
Notes
. We recount only those facts relied on by the O’Connors to support their claim of specific jurisdiction. In their brief, the O’Connors also argued that Sandy Lane is subject to general jurisdiction in Pennsylvania, and in the alternative they sought to transfer the case to the Southern District of New York. See PL Brief 1-2. To that end, they discussed, inter alia, five business trips to Philadelphia by Sandy Lane employees, the mailing of newsletters to approximately 800 Pennsylvania addresses, and Sandy Lane's relationships with public relations and marketing firms in New York City. See PI. Brief 6-8, 21-23. At oral argument, however, the O’Connors’ attorney stated they were abandoning their other arguments and relying exclusively on their claim of specific jurisdiction.
. A slightly refined version of this test applies to intentional tort claims.
See Calder v. Jones,
. We note that our usual practice is to assess specific jurisdiction on a claim-by-claim basis.
See, e.g., Remick v. Manfredy,
. The Court granted certiorari on the question in
Carnival Cruise Lines, Inc. v. Shute,
. Some courts have opined that the test's disjunctive phrasing — "arise out of
or
relate to" — itself implies a "flexible]" and "relax[ed]” standard.
See, e.g., Akro Corp. v. Luker,
.
See
Mark M. Maloney, Note,
Specific Jurisdiction and the “Arise from or Relate to" Requirement ... What Does It Mean?,
50 Wash. & Lee L.Rev. 1265, 1283 (1993) ("[T]he substantive relevance test and the proximate cause test are essentially the same.”);
see also Davis v. Baylor Univ.,
.
See also Wims v. Beach Terrace Motor Inn, Inc.,
.See also Lanier v. Am. Bd. of Endodontics,
. Sandy Lane argues that our decision in
Scheidt v. Young,
. Indeed, even a leading academic proponent of the sliding-scale test perceives some tension between that approach and Supreme Court precedent. See William M. Richman, Understanding Personal Jurisdiction, 25 Ariz. St. L.J. 599, 615 (1993) ("Jurisdiction should exist in cases like Helicópteros; the general/specific distinction should not eliminate the possibility of amenability in cases that fall between the two paradigms. To encompass all the proper cases, the dichotomy should be supplemented with a sliding scale.”); see also Eugene F. Scoles, et ah, Conflict of Laws 306 (4th ed. 2004) ("Whatever the merits of [a sliding scale], it is clear that a fairly sharp . dichotomy between [general and specific jurisdiction] still expresses the view of the Supreme Court.”).
. As Professor Twitchell puts it, simply combine "a little purposefulness, a little relatedness, a little convenience and some state interest,” and — voiW.—"fair jurisdiction, even if the case falls outside the contours of specific and general jurisdiction as they have been defined by courts and commentators.” Id.
. See also Prosser, The Law of Torts, supra, at 236 ("[T]he consequences of an act go forward to eternity, and the causes of an event go back to the discovery of America and beyond. ‘The fatal trespass done by Eve was cause of all our woe.’ ”).
. We cite Pennsylvania authorities only to illustrate the link between the contractual obligation that arose in Pennsylvania and the tort duty that arose in Barbados. We express no opinion on choice of law. See
Burger King,
. Sandy Lane also moved to dismiss under the doctrine of
forum non conveniens.
We express no opinion on that motion and leave it for the District Court to consider in the first instance.
Cf. Foster-Miller, Inc. v. Babcock & Wilcox Canada,
