My mom was traveling from Chicago to visit me in Tempe AZ.. She chose Spirit airlines bc it was cost efficient.. When boarding to fly from Ohare to Sky Harbour she was told that her carry on baggage was fine & that it would also be fine to bring back.. Same airline, same size baggage, no change at all.. She also paid $80 for a second checked bag... When boarding to get on the plane from AZ to Chicago she was told that she wasn't able to bring the baggage on with her but could pay an additional $100 to have the bag on the plane as a "checked bag".. By this point she was not about to pay an extra $100 (literally the cost of probably a one way ticket & just the fact that she paid $80 for the first one.. now it went up to $100) even if she had that on her at the time which she didn't since she gave all the rest of her money to her 19 year old daughter(me) trying to make it on her own in AZ.. They made her transfer all her belongings into a garbage bag & she boarded the plane without her luggage, her belongings in a garbage bag & her luggage thrown away into the garbage..... would not recommend. at all.