Book a flight (6)

I believe the answer is:

exodus

I believe this is a double definition.

'book' is the first definition.
(book of the Bible)

'a flight' is the second definition.
(I know that exodus is a type of flight)

(Other definitions for exodus that I've seen before include "Departure of the holy book" , "Journey of escape" , "Massive outflow of people" , "A great departure as in the Bible" , "Mass migration (of a people)" .)

I've seen this clue in The Globe and Mail, The Irish Independent, The Telegraph and The Guardian.

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