gravy plane trip
n.— «O’Mahoney opposed the flight pay amendment. Senator Douglas (D-Ill) who sponsored the amendment, declared it was aimed at removing “gravy plane trips” for airmen who go up only for the bonus pay and would save 100 million dollars a year. » —Galveston News (Texas) Sept. 14, 1951. (source: Double-Tongued Dictionary)
Further reading
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