About 100 students in the College and graduate schools received letters yesterday informing them that their reduced-rate plane reservations to Europe this summer may be cancelled.

Youth Argosy, a non-profit organization at Northfield that arranges charter fights for students to Europe at $300 below commercial rates, notified its customers that the Civil Aeronautics Board has banned its operations. Unless the action can be put off until October, all reservations for this summer will be cancelled.

Group Appeals Ruling

The C. A. B. stated in its order that it is taking the action to protect commercial airlines running regularly scheduled flights to Europe. Most of the students who go with Youth Argosy, the Board claimed, can afford to pay regular prices, and hence Youth Argosy is directly cutting the business of the regular companies.

Youth Argosy officials are now in Washington seeking to get the order postponed until the end of the summer, so students who planned to go this summer will not be left without any means of transportation. The order became effective on April 1.