KTNT or Dade-Collier in the South Florida region has a problem with aircraft restrictions . The airport can handle an A380 so you should be able to fly one in and out of there. Currently the restriction starts at 757-200. There shouldn’t be one at all.
If it wouldn’t allow you access in an A380 on Live, the restriction works. Solo doesn’t have restrictions, because you’re the only pilot there. How realistic solo is is up to you, since you’re in control of yourself. Also let’s you test things like an A380 on an Echo if you want, because hey, No Wifi (😜)
This airport is classified as a Delta in Infinite Flight, which is why it won’t let you spawn in anything bigger then a 737 or A321. The lowest it can be while still allowing those sized aircraft is Charlie