I'd like to see the popup messages disabled while you're in the hanger if you choose an option not available (bombs, rockets, drop tanks). Instead, I'd like to see the options inside the hanger shaded out so you know at a glance they are not available.
Keep the popups in the tower in case someone tries to spawn at a runway so there wouldn't be any confusion.
edit: if you can't disable the popups in the hanger, could only one popup come up instead of multiple messages if you try and take 2 disabled loadouts?