Superchick (1973)

Tara B. True is a ***ht attendant who makes a weekly swing through New York, Miami, and Los Angeles. In each city, she has a man: Edward, older and wealthy; Johnny, a beach bum with gambling debts; and, Davey, a rock musician on the cusp of success. Tara is a free spirit, faithful to each man in her own way, and so stunning that she dresses in a wig and ill-fitting uniform while she's working so men won't harass her constantly. The low-life whom Johnny is in debt to figures out a way to use Tara to help him execute a daring in-***ht robbery. But will Tara stand by helplessly, or is superchick ready for action?
Tara B. True has created the perfect life for herself as a plain, unassuming, airline stewardess. But once she lands she really takes off, transforming into Superchick - blonde, beautiful, and ready for action - with a guy waiting at every terminal. In New York, There's Dr. Ernest DeRoy, who woos her with first class and highbrow verbal sex. In Miami, there's non-stop fun-in-the-sun sex with beach bum Johnny, who never fails to come through. And in L.A. there's rock star Davey, who's every Hollywood fantasy come true. Superchick is true blue to them all. And if anyone else ever tries anything, there's always her black belt in Karate to fall back on... which comes in handy when her plane is hijacked and it's Superchick who single-handedly saves the day.