We were once delayed a few hours by a frozen cargo door when returning from a holiday in the canaries. It was minus 6 or so back home.

Hilariously as we were all waiting in Glasgow airport and complaining that we weren't getting any information they got the armed police to come in and watch us to make sure we didn't go crazy. Which was rather amusing because we were all being ever so polite and just asking when we could get our shit and leave