If the guy is 5' 4", which he most likely is, then that airplane is 83" wingspan. Just a tad larger then the OMP 80" Edge.
The guy holding is 420 pixels. The airplane is 550 pixels.
Therefore:
(64/420) x (x/550)
420 X = (64) x (550)
X = 35200/420
Therefore X = 83.8"