I’ve seen, that displaying the players name on all aircrafts is in the pipeline. Here my suggestions for an individual design by the player:
- Selection of (a few) fonts, regular and condesed, should fit to the aircrafts fuselage
- Font color black or white selectable
- Font generally with outline, black or white selectable
And…it should be free without paying extra for it!
See example. Should work with ANY color scheme. 
Without outlining it might be difficult to read (e.g. black over blue).