Sunday headcanon: they fly all the time, but never hesitate to call each other being the plane leaves the ground. They also call as soon as they can once the plane lands. It’s just tradition. « Be safe, I love you, » etc. But once, he doesn’t. That’s because he doesn’t want her to know he’s flying to her this time. She wants to be mad about it when they meet up, but she kisses him senseless instead.