Can you guys stop breaking stuff?

Think you need to calm down kid, there are more serious issues in this world than not being able to send out a flight in a game, if you haven't got any characters free then you'll have to wait until everyone returns, if you have people waiting to go on flights, set them on tasks, making sure there are other people free to take the place of them and then look, as the other US flight has come back, maybe it will come up then...

Other than that, give it a few hours and try again, it's not the end of the world and a little throwaway helpful hint like that does not deserve the response you gave, whether or not you felt upset by it in any way