Aviators prefer the Lambert projection and seafarers, the Mercator one. It makes sense: aviators navigate often by radio signals that follow the great circle or gnomonic path, closer to Lambert, while seafarers follow a rhumb course as a straight line on the Mercator.
But when I use my GPS moving map in my little aircraft, if e.g. I head west from my location in Norway, and zoom out to show north Europe, my heading point towards south England and not Scotland, as it should if I was flying on a compass course of 270. This is because the great circle from my latitude 60 north, bends southward on an initial heading of 270.
I know, gnomonic navigation is the path of the shortest distance and what we would prefer as pilots. But I have never been flying more than 20 minutes without a waypoint on a flight plan, hence flying from point to point in such short distance that the gnomonic vs. rhumb line doesn't make a difference.
So, why not using Mercator in the air? Pilots did it in the past, when they navigated with a bubble sextant, needing spherical trigonometry.