Gosh I'm not sure about this....Yahoo I have no idea how they got there.
This aircraft's unveiling is seen in between sides, nothing 26 (4-3)= Roll out
R(ight) O(nothing) L(eft) L OUT a Yahoo is a lout(26)
Roll out= unveiling
Where the aircraft bit comes in defeats me...and there is absolutely no way I could ever have got to this answer.
I await someone better than me (not difficult) to give the real explanations.