Interesting I would never have guessed this one. I've been tracking events at other potential G4 cities but missed this as a possibility.
According to BIS area media, an agreement has been approved for Allegiant to start service in a few months.
It appears Allegiant plans to start BIS-LAS service with a different service pattern also. According to the Bismarck paper the flights will operate on Mon, Wed, and Fri. Normally Allegiant starts a city with 4 day a week service.
No official announcement from the airline yet. I also expect to see another city reach agreement with G4 in the next few weeks.