A good friend told me the following:
Male Air Trafficker notices one morning that a new, very sexy female voice is has started chatting to him over the radio.
Male Air Trafficker turns on the charm, which seems to wind the lassie in the cockpit up a little bit.
Lady Pilot: "Excuse me tower, but where exactly does FLIRTING come in the pre-takeoff checks?"
Chappie in the tower replies fast as lightning: "After flaps!".
Oh dear, if only she knew what she'd missed.......