Not yet. This is only the Beta.
The methods of communication thus far established are:
Teamspeak servers.
Waggling your wings to indicate friendliness.
Opening and closing your cargo scoop also to indicate friendliness.
You could flash your lights in Morse Code but that'd take ages.
you've both forgotten about the top gun maneuver, where you 'Buzz' other pilots - crashing into them for the lol's - sending them spinning like a top, then high tailing it out of there.