[Nifster]

Change the airplanes first. IF one can. Truth is that physics is an unforgiving mistress

[pfflier]

Seems to me changes in both have been concurrent. As airplanes change most airports became inadequate particularly runway length and endurance. As airports changed, they enabled more radical changes in airplane design.

The A-380 is a classic example. Economics logic says move more people with fewer airplanes. Reality says most airports are unable to handle the bulk of the plane or the number of passengers. "Super hubs" have evolved because of that.