I’m thinking he uses the Cessna jet to land at the smaller airports.
Possibly if we’re talking about the Citation X. As mentioned by smarter pilots than myself.
Runways and taxiways may not be able to handle an aircraft the weight of a 757. Also remember that some important bizjet airports, KTEB and KASE in particular, have size restrictions on wingspan and weights to keep larger aircraft out.
The far greater speed of the Citation X, its higher service ceiling, combined with its better airport access means that Trump could see huge time savings on many flights, especially transcons. The 757 will provide greater comfort on longer flights (and I believe his has aux tanks to give it considerably longer legs than the Citation), but at a huge cost in time on shorter ones.
A Citation X is no slouch, needing well under 6000 ft at MTOW. There are plenty of small or even medium size GA airports where parking space for an airplane the size of a 757 would be an issue. Depending on which ramp and FBO you taxiid to, KORL would be a tight fit on the ramp. I also know that a 757’s engine’s have clearance issues with the runway lights, the wings would overhang other taxi ways which could cause traffic flow issues. Also, not all FBO’s will be equipped to fully service a 757. There are FBO’s at KORL class airport that can’t provide ground power or air start to an aircraft that size, so better hope you don’t have an APU issue.
In essence, this is probably going to be an FAA issue, not a Trump LLC C issue....
and so it goes.