There are no seatbelts on the mock airplane set of Jenny Rogers’s adaptation of Maria Irene Fornes’s Fefu & Her Friends. None are needed: Wickets is engaging and smooth, but it’s hardly dramatically turbulent. Nor should it be: by sticking to the surfaces, co-directors Rogers and Clove Galilee are being true to the eight stewardesses on Wicket Air Flight #1971. (The feminist content has been updated from 1935 to 1970.) The deeper truths come out in loose yet cryptic monologues, and through an interpretation of Fornes’s experimental style that collages text and breaks out into song and dance.