According to FlightAware, the flight was 5 hours late. The tower would likely have been closed at the time of their arrival.
Actually, it could happen very easily. Here is an example...
SWA: runway in sight. We will take the visual...
ATC: roger, cleared for the visual approach runway three-two. Contact Branson Tower on 128.15. Good night
SWA: cleared for the visual. Contact tower. Good night...
[crew flips switch to tower frequency]
SWA: Branson Tower, Southwest 4013 visual to runway three-two.
ATC: southwest 4013, roger. Not in sight, cleared to land runway three-two..
SWA: Roger... Cleared to land...
[airplane lands at wrong airport]
[sound of that irritating woman's voice, in a demeaning manor] Recalculating...