Opinion for the Court filed by Circuit Judge ROGERS.
Appellant shippers, including the Government of Guam,
1
sought reparations from ap-
*144
pellee carriers
2
in а proceeding before the Federal Maritime Commission for allegedly unlawful rates under the Shipping Act, 1916, and the Intercoastal Shipping Act, 1933.
3
Appellants thereafter filed a virtually identical claim in the United States District Court for the District of Columbia. The district court dismissed the complaint for lack of subject-matter jurisdiction. Appellants now contend that the district court erred by not inferring an implied private civil action under the Shipping Acts, and by not allowing appellants an opportunity to amend the complaint. For substantially the reasons set forth in the thoughtful оpinion of the district court,
Government of Guam v. American President Lines, Ltd.,
I.
The context in which this appeal arises is set forth in the District Court’s opinion from which we quote:
On December 7, 1989, the Government of Guam filed a complaint with the Commission. That complaint is virtually identical to the complaint in the instant ease. Each complaint includes four counts. Counts I and II allege that both defendants charge Guam shippers unjust, unreasonable, and discriminatory rates in violation of sections 16 First, 17, and 18(a) of the Shipping Act, 46 U.S.C.App. §§ 815 First, 816, & 817(a), and section 2 of the Intercoastal Shipping Act, 46 U.S.C.App. § 844. Counts III and IV allege that defendant Sea-Land operates as a water common carrier without having a required tariff on file with the Commission, * and also that Sea-Land improperly charges varying rates for similarly situated shippers, in violation of sections 16 First and 17 of the Shipping Act, 46 U.S.CApp. §§ 815 First & 816, and section 2 of the Intereoastal Shipping Act, 46 U.S.CApp. § 844.
On March 9, 1990, an administrative law judge granted Guam leave to amend the Commission complaint to add four shippers as plaintiffs. Three of those shippers are among the plaintiffs in the present ease. In the same ruling, the ALJ dismissed that portion of the complaint seeking reparations on behalf of all similarly situated Guam shippers under a parens patriae theory. In so ruling, the ALJ relied on Commission decisions holding that reparations may be awarded only to those who have actually paid unreasonable rates unless there has been a valid assignment from one with a legal right to reparations. The Commission proceeding is presently ongoing.
Plaintiffs’ complaint was filed in this Court on March 10, 1992. Plaintiffs’ asserted purpose in bringing this action in court is to “toll” the two-year statute of limitations for the numerous Guam shippers that have allegedly been injured by defendants’ shipping rates. They have thus moved for certification of a class consisting of shippers and persons who have dispatched or received shipments into or out оf Guam via the defendant carriers. At the same time, plaintiffs have moved for a stay of proceedings in this case pending the Commission’s determination in the parallel administrative proceeding. Plaintiffs thus concede that the Commission has the task of resolving the merits of the dispute; they call on this Court essentially to preserve, and ultimately to administer, the claims of the class.
*145
Guam, I, supra,
II.
Implying a private cause of action where the statute provides a remedy.
Appellants concede that the Shipping Acts do not expressly provide for a private fеderal cause of action by a shipper to challenge a carrier’s rates, but they contend that the district court erred in declining to infer, upon applying the factors in
Cort v. Ash,
Where a statute provides an express remedy,
Cort v. Ash
is, strictly speaking, inapplicable. In that case, the Supreme Court stated that “[i]n determining whether a private remedy is implicit in a statute not expressly providing one, several factors are relevant.”
4
Yet, as our opinion in
Danielsen v. Burnside-Ott Aviation Training Ctr., Inc.,
More precisely, the Supreme Court has made clear that when Congress has provided an express remedy, not all of the
Cort
factors have the same weight because the central analysis is directed at discovering legislative intent by means of “the language of the statute, the statutory structure, or some other source.”
Karahalios v. National Fed’n of Fed. Employees, Local 1263,
Accordingly, in the instant case, the district court concluded, upon examining the statutory scheme in the Shipping Acts and the different language in the Interstate Commerce Act, that in the absence of evidence of congressional intent to imply a cause of action, the conclusion was compelled, under
California v. Sierra Club, supra,
We
find no error in the district court’s analysis. First, the Shipping Acts include a specific reparations remedy.
See
46 U.S.C. app. §§ 821(a), 845a. Second, the statutes provide for enforcement proceedings in the district court.
See
46 U.S.C. app. §§ 828 & 829;
Massachusetts Mut. Life Ins. Co. v. Russell, supra,
Application of the
Cort
factors leaves appellants in no better position. Even assuming that they meet the first and third
Cort
factors — if appellants are within the class for whose benefit the Shipping Acts were enacted and if inferring a private cause of action is consistent with the underlying purposes of the legislative scheme — appellants point to no legislative history or other source to suggest that Congress intended to imply an additional remedy to the express administrative remеdy it provided (the second
Cort
factor) in the Shipping Acts. Appellants have the burden to show some evidence of congressional intent to create a remedy in addition to that expressly provided,
Suter v. Artist M.,
— U.S. -, 112 5.Ct. 1360, 1370,
Appellants’ contention that their position does not involve an attempt to “usurp” the authority of the Federal Maritime Commission is beside the point. Appellants consider the administrative remedy inadequate because of (1) the costs to individual shippers in an administrative proceeding attacking an entire tariff structure, as distinct from a proceeding seeking reparations for overcharges on a particular cargo shipment, (2)
*148
the two-year statute of limitations in the face of a proceeding that has been going on for more than three years, and (3) the unavailability of class action or
'parens patriae
administrative procedures. Whether procedural inadequacies exist in the administrative proceeding can be addressеd on appeal from a final order of the Federal Maritime Commission, as appellants acknowledge. Further, as appellants’ colloquy with the district court regarding the possibility of a class action before the Commission makes clear, their contention that the remedies under the Shipping Acts are unavailable to the Guam shippers is still to be demonstrated.
8
Indeed, were there evidence that the administrative proceedings could not adapt to what appellants characterize as a proceeding that is unique in scope, such considerations would not overcome the absence of evidence that Congress intended to imply the existence of a private protective cause of action in anticipation of a favorable administrative ruling on behalf of a class.
See Saltzman v. Farm Credit Servs. of Mid-America, ACA,
Many of the cases relied on by appellants for inferring a cause of action were decided before
Cort v. Ash, supra,
(1975), and
Karahalios v. National Fed’n of Fed. Employees, supra,
(1989), where the Supreme Court made clear its shift in emphasis from its prior standard to evidence of congressiоnal intent to imply a private cause of action.
9
Other cases are readily distinguishable.
10
*149
Contrary to appellants’ contention, nothing suggests that the parties’ failure in
Karahalios v. National Fed’n of Fed. Employees, supra,
to pursue their administrative remedies prior to bringing suit in court was a relevant consideration in the Supreme Court’s decision not to infer a private cause of action; rather, the Court’s conclusion was based on the lack of evidence of congressional intent.
Accordingly, we affirm the district court’s dismissal of appellants’ complaint for lack of subject-matter jurisdiction.
III.
Amending a complaint. Appellants also contend that the district court erred in dismissing the complaint without affording them an opportunity to amend. With such an opportunity, they maintain that they could *150 have added new legal theories under the Interstate Commerce Act, see 49 U.S.C. § 10701(a), and in admiralty, pursuant to 28 U.S.C. § 1333.
The complaint purported to state a cause of action under the Shipping Acts, exclusively. However, in their opposition to the motion to dismiss, appellants stated that if the Federal Maritime Commission were to agree with one of the carriers that it was subject to the jurisdiction of the Interstate Commerce Commission, then appellants would amend their complaint to add a claim under the Interstate Commerce Act and a claim in admiralty. 13 Likewise, during argument on the motion to dismiss, appellants’ counsel indicated that their interest in pursuing other legal theories rested on a future ruling by the Federal Maritime Commission and the court of appeals. 14
“The normal procedure for requesting an amendment to the complaint in federal court is to file a Fed.R.Civ.P. 15 motion to amend together with the proposed amendment or new pleading.”
15
Bank of Waunakee v. Rochester Cheese Sales, Inc.,
Appellants’ counsel did not file a motion to amend the complaint, nor did they submit an amended complaint to the district court. The district court’s remarks during argument, expressing doubts about appellants’ theory of an implied cause of action under the Shipping Acts, put appellants on notice of the need to amend the complaint if they wanted new theories to be considered by the district court.
16
Yet, appellants’ counsel did not advise the district court of their readiness to amend the complaint, even in the face of appellees’ counsel’s reference during argument to the fact that appellants had not amended either their administrative complaint or their district court complaint to state a claim under the Interstate Commerce Act. Under these circumstances, we conclude that neither аppellants’ opposition to the motion to dismiss, nor their counsel’s reference to the assertion of new legal theories contingent on future administrative action, was sufficient to constitute a motion under Rule 15(a) to amend the complaint.
See Glenn v. First Nat’l Bank in Grand Junction,
Appellants also did not seek leave to amend their complaint after the district court granted appellees’ motion to dismiss; instead appellants filed a notice of appeal.
See Confederate Memorial Ass’n, Inc. v. Hines, supra,
Appellants, further, have not suggested why an exception to the general rules favoring the finality of judgments and the expeditious resolution of litigation should be made in their case.
17
While our approach need not be inflexible,
18
appellants offer no reason for not following the normаl course for amending a complaint, and we are confronted with a record showing that their interest in amending the complaint rested on a future contingency that has yet to occur. Accordingly, we hold that appellants have waived the right to raise the amendment claim of error on appeal,
see The Dartmouth Review v. Dartmouth College, supra
note 18,
Affirmed.
Notes
. Appellants are the Government of the Territory of Guam, Pacific International Co., Inc., Town *144 House Department Stores, Inc., Micronesian Brokers Incorporated, and R.R. Cruz Market.
As of June 23, 1989, Sea-Land began filing tariffs with the Interstate Commerce Commission (ICC) instead of the FMC. The two Commissions have separate jurisdictions, the FMC governing port-to-port water carriers and the ICC governing intermodal (e.g., rail-and-water) carriers. See 46 U.S.C.App. §§ 801, 832, & 845b.
. Appellees are American President Lines, Ltd. and Sea-Land Service, Inc.
. Two statutes are at issue. Appellants alleged that appellee carriers charged rates in violation of (1) §§ 16 First, 17, and 18(a) of the Shipping Act, 1916, 46 U.S.C. app. §§ 815 First, 816, & 817(a) (1988), and (2) § 2 of the Intercoastal Shipping Act, 1933, 46 U.S.C. app. § 844 (1988). In this opinion we refer to the former statute as the Shipping Act and to both acts as the Shipping Acts.
. In
Cort v. Ash,
the Supreme Court identified four factors: (1) whether the plaintiff is part of “the class for whose
especial
benefit the statute was enacted"; (2) the evidence of "legislative intent, explicit or implicit, either to create such a remedy or to deny one"; (3) whether inferring such a right is "consistent with the underlying purposes of the legislative scheme”; and (4) whether the cause of action is one traditionally relegated to state law.
. Appellants mistakenly suggest that
Cort v. Ash, supra,
discarded statute comparison as a method of gleaning congressional intent. In
Cort,
the Supreme Court simply found the statutory comparison before it to be unhelpful.
Cort v. Ash, supra,
. Appellees maintain that "[p]rior to enactment of the Shipping Act, several bills were introduced and considered that would have given express rights to sue for damages caused by violations of the Act, yet these provisions were rejected in favor of the administrative remedy ultimately enacted into law.” See H.R. 17328, 63d Cong., 2d Sess. § 19 (June 18, 1914); H.R. 450, 64th Cong., 1st Sess. § 19 (Dec. 6, 1915) (reintroducing H.R. 17328); H.R. 14337, 64th Cong., 1st Sess. §§ 12, 14 (Apr. 7, 1916); and H.R. 10500, 64th Cong., 1st Sess. § 9 (Jan. 31, 1916). Each of these bills provided for a district court damages action. Appellees rely, therefore, on the fact that while Congress incorporated a number of provisions from these bills into final enactment, it did not incorporate the provisions providing a district court damages action.
The legislative history indicates that Congress decided to create a separate shipping board “vested with such powers [as the Interstate Commerce Commission has]” rather than extend the jurisdiction of the Interstate Commеrce Commission to common carriers.
See
H.R. Rep. No. 659, 64th Cong., 1st Sess. 32 (1916); House Comm, on the Merchant Marine and Fisheries, Report on Steamship Agreements and Affiliations in the American and Domestic Trade, H.R.Doc. No. 805, 63d Cong., 2d Sess. 422 (1914) (the Alexander Report). Congress omitted from the Shipping Act a provision comparable to one in the Interstate Commerce Act providing shippers a private federal cause of action as an alternative to an administrative proceeding.
See
49 U.S.C. § 9 (1959). To this extent, the omission suggests that Congress implicitly rejected the idea of a рrivate remedy under the Shipping Act.
See United States Navigation Co. v. Cunard S.S. Co., supra,
. Appellants' contention that the district court erred in applying the doctrine of primary jurisdiction is meritless. That doctrine does not create jurisdiction where none otherwise exists.
See United States v. Bessemer & Lake Erie R.R. Co.,
. The district court suggested to appellants' counsel that there could be representation of other shippers by appellants' counsel, and that equitable and other remedies could be a part of the administrative proceedings, including requesting that the Guam shippers be certified as a class before the administrative agency. Noting that appellants’ counsel had not asked the administrative agency for class relief, the district court observed that although the agency rules were silent on class relief, there was nothing to prohibit it. Appellants' counsel did not dispute that these possibilities could be pursued in the administrative proceedings, but counsel focused on the burden of notifying all Guam shippers in addition to the three points noted in the text of this opinion. In their brief on appeal, appellants acknowledge the possibility of assignment of claims.
. Thus,
Wyandotte Transp. Co. v. United States,
. Maritime Serv. Corp.
v.
Sweet Brokerage De Puerto Rico, Inc.,
. There is no merit to appellants' contention that
Carnation Co. v. Pacific Westbound Conference,
. The underlying claim in
Interconex, Inc. v. Federal Maritime Comm'n, supra,
. The concluding рaragraph of appellants’ opposition to the motion to dismiss also stated that: plaintiffs can and will amend their Complaint, if necessary, to assert additional claims, under different legal theories, which are indisputably within this Court’s jurisdiction. If there is
any
doubt about this Court's jurisdiction over the claims already pled, therefore, plaintiffs request that the motion be denied on the condition that plaintiffs amend their Complaint
as discussed above. See Friedlander v. Nims,
. Appellants' counsel twice stated that appellants wanted the district court to deny apрellees’ motion to dismiss or, alternatively, "to stay the case, and to await a determination by the [Federal Maritime Commission] as to an issue that could clearly give us a jurisdictional basis to proceed before the court.”
. Fed.R.Civ.P. 15(a) provides:
A party may amend the party’s pleading once as a matter of course at any time before a responsible pleading is served or, if the pleading is one to which no responsive pleading is permitted and the action has not been placed upon the trial calendar, the party may so amend it at any time within 20 dаys after it is served. Otherwise a party may amend the party’s pleading only by leave of court or by written consent of the adverse party; and leave shall be freely given when justice so requires.
. Appellants’ reliance on
Thomas W. Garland, Inc. v. City of St. Louis,
.
See National Petrochemical Co. of Iran v. M/T Stolt Sheaf, supra,
.
See, e.g., The Dartmouth Review v. Dartmouth College,
