The plane was carrying 146 passengers and 6 crew members at the time of incident; all of them remained unharmed.
Jessica Wheeler, a spokesperson for Allegiant, said the plane diverted and landed safely after a hydraulic warning light came on. She also said that Allegiant sent a replacement plane from Las Vegas to pick up the passengers and take them to Missoula.
Some passengers said the issue appeared to be more serious than a mere warning light.
Allegiant’s maintenance crew is examining the plane.