Statute of limitations is expired so I'll tell my United story. August 1967, returning from sea, booked my flight from San Diego to home while ship was in Pearl Harbor for fuel. Disembarked in North Island in my dress uniform, straight to airport for flight, United counter agent said "your flight was rescheduled in Denver and there was less than the required delay for an aircraft change so we tried to contact you for rebooking. When we couldn't, we canceled your ticket. Would you like to rebook at full fare?" I was livid. And 19 and bulletproof. I left the gate, found an unattended one, swiped a boarding pass folder and a marker pen. Found a United flight headed east, bravado'd my way on board, gate-checked my seabag. Did the same in Denver. Got to 100 miles from home and wow one of my high school buddies was gate agent at that airport. Got a refund of the ticket price and a ride home from him that night. I'm sure they aren't still that fouled up ... right?