In Air Line Stewards & Stewardesses Ass'n Local 550 v. American Airlines, Inc., 490 F.2d 636 (7th Cir. 1973), cert. denied, 416 U.S. 993, 94 S.Ct. 2406, 40 L.Ed.2d 773 (1974), American Airlines and TWA had permanently discharged stewardesses who became pregnant. The Association, certified bargaining representative for airline cabin attendants, brought suit to enjoin the practice, and after the companies terminated the practices, negotiated a settlement. Objecting stewardesses appealed approval of the settlement by the district court. The appellate court noted that the Association, which was composed of active airline attendants, could not adequately represent the former attendants because the two groups had conflicting interests. The former stewardesses would desire reinstatement with no loss of seniority, leapfrogging them over less senior active stewardesses. Seniority had an important effect on promotions, trip assignments, and other aspects of employment. The court, desirous of allowing the former stewardesses to opt out of the settlement, held that a (b)(3) subclass should have been created.