Delays getting to the airport and missing the plane. Cancelations with full refund. "Hidden city" ticketing. Layover delays. Businesses booking blocks. Fle

Delays getting to the airport and missing the plane. Cancelations with full refund. "Hidden city" ticketing. Layover delays. Businesses booking blocks. Flexible flights ( https://www.travelperk.com/guides/flexible-travel/flexible-flights/ https://www.travelperk.com/guides/flexible-travel/flexible-f... ). Changing / rebooking flights for an earlier or later time.