I only give 2 stars instead of 1 because other than this one travel nightmare, I get from point A to point B without much problem.
Here's the Travel Nightmare. I was on a flight from LAS to IND to attend my daughter's college graduation the next day. When we got to IND there was a big thunderstorm over the airport, so we circled for a while, and then the pilot said we had to divert to Cincinnati because we were running low of fuel. Allegiant serves Cincinnati. Ok, I get that - that can happen. We landed in Cincinnati.
Here's where the horror story begins. The storm cleared Indy by the time we got to CVG. They wouldn't send the plane back to IND, presumably because they wanted to save fuel money and use that plane from CVG to LAS the next day. The gate agent/supervisor announced that they had to await instructions from the Allegiant ops center. Ok, I can understand that. We waited a couple of hours. Finally, the gate sup said that they were calling some limo bus line in CVG to see if they can take us. By this time it's midnight or so. It seemed like nobody at the limo service answered - they probably didn't want to wake up and drive us to Indy. It was some no-name limo service, not like a Greyhound, which Amtrak uses in similar situations. We wait ANOTHER 2 HOURS, and then, wait for it---- the gate sup gets our attention by the podium. Understandably people, and a number of them aren't seasoned travelers like me, are really irate. A couple of passengers turn on their cell phones to video her announcement. The gate sup gets real defensive, and announces that she refuses to say anything IF ANYONE IS RECORDING! We are all incredulous, but those with phones turn their cams off. She then proceeds to tell us that ALLEGIANT WILL NOT FLY US TO INDY IN THAT PERFECTLY GOOD PLANE NOR PROVIDE A BUS FOR US because they couldn't get a hold of the limo service. She does say that, at 3 a.m., they'll reimburse us for a hotel room after we turn in receipts, and if we choose to go to downtown Cincinnati and take a Greyhound bus, or get an Uber, they'll send us reimbursement. Luckily as I was walking out of the airport I was with a gentleman who was calling Uber to see if anyone would drive all the way to the Indy airport, and asked if I could carpool with him. We fortunately did find someone crazy enough to take us there. But BE FOREWARNED - IF YOU GET DIVERTED TO ANOTHER CITY OTHER THAN YOUR OWN DESTINATION, YOU'RE ON YOUR OWN!
As to the recent media reports about the problems with their older planes, which they're replacing little by little, I've not had any problems, and figure that now that they are under a very large and uncomfortable public microscope, they'll be more vigilant about their planes. I've not had any problems with nasty inflight crews. The CVG gate crew and sup were the worst ones I've seen with this airline.