What did annabeth say to get the gray taxi service come in Percy Jackson books?

Annabeth never actually called a "Gray Taxi Service" in the Percy Jackson books. This is likely a misunderstanding or a reference to a different piece of media.

It is true that in the *Percy Jackson & the Olympians* series, Annabeth has a knack for finding transportation and getting things done. She is often the one who figures out how to get them to the next place or solves their problems. However, she never uses a specific service called "Gray Taxi Service".

Could you clarify what you are referring to? Perhaps you are thinking of a different book or movie?