I'm sure many people are tired of seeing 20+ formations of lancs NOE to a base to level it in the matter of 2 seconds. so heres my proposition
single aircraft keep their ENY. e.x - B17 is 12.0 ENY cost. when you "check" the formation box. the ENY should be lowered by a third of the ENY it is for the single plane. so a single B17 would be 12 ENY. but when you take the formation, its 8 ENY.
also, bomber formations should cause the country wide ENY to go up substantially. its ridiculous to have 30+ formations of heavy bombers up all at once for each country.
therefore, I think bomber formations shouldnt be taken so lightly when it comes to ENY balancing