Add a flare gun-this would make pilots more emersive and it would lead to a quick notifying RED BALL in the sky that tells you that he needs air support or a quick pick up
add walki talkies-with them you could comunicate with people that arnt in youre squad-a walki talki in a plane would make it way more realistic with that people could call you for a quick talk for help so they dont alert everyone by shooting a flare this would mean you can only call a plane every minute