In Arnold Tours, Inc. v. Camp, 400 U.S. 45, 91 S.Ct. 158, 27 L.Ed.2d 179 (1970), travel agents sought, again under section 4, the right to contest the Comptroller's ruling that national banks could provide travel services for their customers. Remarking that nothing in Data Processing limited the protection provided by section 4 of the Bank Service Corporation Act to competitors in the data processing field, the Court upheld the right of these agents to sue, explaining that "(w)hen national banks begin to provide travel services for their customers, they compete with travel agents no less than they compete with data processors when they provide data-processing services to their customers." Id. at 46, 91 S.Ct. at 159.