manhattan's what, three miles wide? a straight line going three miles at 40 miles per hour would take four and a half minutes. 270 seconds. if it took him so much as twenty, that's still less than a tenth of the time it would take going at 40 mph, and more than ten times the speed of 40 mph. so he's at least flying somewhere in the hundreds of miles per hour.
to bisect the wing of a plane, even a plane "slowing" to attack speeds (which, i'll say is a generous 200 miles per hour,) and tear a hole hardly wider than his own width implies that in the time it took to get his six-feet and two inches through the wing of the plane, the plane moved forward hardly an inch. being generous, again, we'll say the plane moved six inches forward at two hundred miles per hour in the time it took namor to move 74 inches. namor would be moving more than twelve times as quickly as the plane, thus moving at speeds greater than 2400 miles per hour.
both of those instances take simple math applied to scenes you claim have no "reference" speeds. planes need to be moving at several hundred miles per hour to stay aloft, and fighter jets in particular are known for their incredible speed. even when slowing down to paveway a target, they still pass over the target at speeds of (at least) two hundred miles per hour. the derivation of the latter mathematics was taken from the panels, and from known facts about aircraft. the first was simple conjecture. BOTH, however, showed him moving significantly faster than his handbook entry says he can.
why's it such a big deal to accept that he can move at such speeds? he can, and he's done it before. why go through all the trouble of attempting to discredit a scene because "there's no reference" for how quickly he's moving? who even cares if he can fly faster than storm? he's fast, and he's faster than the handbook says he is. can we end it there?