Well, it's not as if Sunbow-G1 Astrotrain was given a consistent size....My only concern is that [Sky Lynx] is supposed to be a “giant” space shuttle. Yet, in the “Big Broadcast of 2006” he’s shown as the same size as Astrotrain in robot mode when they encounter each other mid-air over Junkion.
Even factoring in between-mode size shifting, in TF:TAM his shuttle mode goes from Thrust-having-to-duck-down to can-fit-Devastator....