https://central.xero.com/s/question/0D58V00009SkucpSAB/18668843315does-united-still-offer-free-cancellation-freecancellation
https://central.xero.com/s/question/0D58V00009SkzlxSAB/18668843315how-late-can-you-cancel-your-united-flight-flighthelpdesk