Allegiant
. When my folks were still snowbirding in the Clearwater FL area I tried them out of Belleville IL. A one horse airport with probably one flight a day? We take off and before we get to cruising altitude I see a steward carrying a fire extensisher. There was a slight haze in the air or maybe just an odor?? This is not good. Well the captain announce we are returning. Since TSA had gone home they told us if we depart the terminal we can't get back in. They had called a mechanic in. We wait, the snack machine gets cleaned out. Mechanic arrives...numerous run ups and it is finally determined they accidentally got de-icing into the engines. So I get to Clearwater after dark and get the shuttle cab to my folks place. I was watching airplane crash videos on YT and recall Allegient had a crash due to sloppy/cost cutting maintenance. Nice to know after the fact.