After being blocked in his attempt to keep CNN out of the White House altogether (including the main press briefing room), President Trump has excluded CNN from traveling with him on Air Force One. This, though, he is quite likely allowed to do.
As you likely recall, last year Trump kicked AP out of the Oval Office press pool, because the AP had refused (in my view correctly refused) to call the Gulf of Mexico "the Gulf of America." A D.C. Circuit panel majority, to oversimplify slightly, concluded that this was constitutionally permissible, both as to the Oval Office and as to Air Force One. An excerpt from that 2025 decision (AP v. Budowich):
The White House is likely to succeed on the merits because these restricted presidential spaces {Oval Office, … Air Force One, and … the President's home in Mar-a-Lago} are not First Amendment fora opened for private speech and discussion. The White House therefore retains discretion to determine, including on the basis of viewpoint, which journalists will be admitted.