Cost for a carry-on to go up to $100. That's the cost for carrying the bag onto the aircraft, not how much the bag cost in the store. This is Spirit's new policy for carry-ons when you pay the fee at the gate. If you pay at the kiosk while checking in, the cost remains a "reasonable" $45. http://www.nytimes.com/aponline/2012/05/02/business/ap-us-spirit-airlines-fee-hike.html? No word on whether dying vets will have to pay more or less to check their bags.