you don’t really save money on spirit, you think you do. big myth. For example you pay 30$ to go on spirit From JFK to FLL. cost $30 oh you want a glass of water? that will be $10. you want a carry on? another $30.
JFK to FLL on delta, jetblue or AA. $59 Includes carry on and glass of water, among other services. so unless your willing to fly just the shirt on your back you end up spending the same amount of money on spirit airlines.