| Chicago to Leon. The website stated that if I checked in with a person at the ticket counter I would be asked a fee but that if you used there mobile app it would be free. I had no luggage so this was fine with me. I got to the airport 2 hours before and as I waited in the huge TSA security line, checked in via there mobile app on my phone, there app had some issues, so I was unable to retrive my boarding pass. Showed TSA agent what I had and he instructed me to go back to the ticket counter, after waiting im line for an hr, I approached a Volaris worker walking past TSA and informed them of the problem. She stated that she would radio over to the boarding gate and to run to the Volaris ticket counter which I did. Upon arrival to the ticket counter staff stated that nothing could be done, that it was to late to print me a boarding pass, that that all sales were final. The only thing she could do was to get me another flight to a different state and that i would have to pay a penalty fee on top of the fare difference. Long story short, I ended up missing my fathers funeral because of Volaris and still had to fight with my credit card to fight the charges which after a lot of back and forth with Volaris was able to finally get my money back from my CC even though Volaris refused.