Cite as: 513 U. S. 219 (1995)
Opinion of the Court
value of already accumulated mileage credits, or only to change the rules for credits earned from and after the date of the change? That pivotal question of contract interpretation has not yet had a full airing and remains open for adjudication on remand. Pp. 233-234.
157 Ill. 2d 466, 626 N. E. 2d 205, affirmed in part, reversed in part, and remanded.
Ginsburg, J., delivered the opinion of the Court, in which Rehnquist, C. J., and Kennedy, Souter, and Breyer, JJ., joined, and in which Stevens, J., joined as to Parts I (except for the last paragraph) and II-B. Stevens, J., filed an opinion concurring in part and dissenting in part, post, p. 235. O'Connor, J., filed an opinion concurring in the judgment in part and dissenting in part, in which Thomas, J., joined except for Part I-B, post, p. 238. Scalia, J., took no part in the decision of the case.
Bruce J. Ennis, Jr., argued the cause for petitioner. With him on the briefs were Jerold S. Solovy, Marguerite M. Tompkins, Donald B. Verrilli, Jr., Richard A. Rothman, Bonnie Garone, and Michael J. Rider.
Gilbert W. Gordon argued the cause for respondents. With him on the brief were Robert Marks, Michael J. Freed, Michael B. Hyman, Nicholas E. Chimicles, Ira Neil Richards, and Steven A. Schwartz.
Cornelia T. L. Pillard argued the cause for the United States as amicus curiae urging reversal. With her on the brief were Solicitor General Days, Assistant Attorney General Hunger, Deputy Solicitor General Kneedler, Robert V. Zener, Jonathan R. Siegel, and Paul M. Geier.*
Justice Ginsburg delivered the opinion of the Court.
The Airline Deregulation Act of 1978 prohibits States from "enact[ing] or enforc[ing] any law . . . relating to
*Briefs of amici curiae urging reversal were filed for the Chamber of Commerce of the United States of America by Kenneth B. Alexander and Stephen A. Bokat; for the Air Transport Association of America by John G. Roberts, Jr., Walter A. Smith, Jr., Mary E. Downs, John R. Keys, Jr., and Calvin P. Sawyier; and for United Air Lines, Inc., by Kenneth W. Starr, Paul T. Cappuccio, and J. Andrew Langan.
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