다음 글의 내용으로 추론할 수 있는 것은? While waiting for your scheduled flight out of town, you can be tempted to get "bumped" from an overbooked flight. Many people think that if you have a few magazines to read and can catch a later flight, volunteering to be bumped is a very lucrative arrangement. However, airlines are no longer as generous as they once were. Compensation for volunteers often amounts only to "free flight" vouchers that are full of restrictions. It may be wiser to request dollar-amount vouchers, which usually are not subject to blackout dates and have fewer limitations.