为自己加油

The airplanes were delivered with recommended inspection programs to keep them airworthy.

A.为了保证飞机的适航性，飞机被推荐了检查程序。
B.推荐的检查方案随飞机一并交付，以保证其适航性。
C.飞机交付了推荐的检查程序，以保持它们的适航性。