Happened to me about 10 years ago. Manx Airlines from LHR (ahhh) to IoM.
G-MIMA the faithfull 146 broke down. ATP and J41 dispatched. Crew got on the J41, which left OK. ATP was further delayed when a pax urgently needed medication stowed in hold baggage. On board at a remote stand in high summer for some two hours. No APU so no aircon. Crew asked whether we were going to IoM and pax told yes. Aircraft eventually departs and pax are told by Captain of IoM arrival time (hurray!). Then after half an hour or so Captain announces Ronaldsway closed, and we are diverting to LPL.
Subsequently learned that IoM had closed BEFORE our departure from LHR!
All pax very p***ed off because no options given. Loads of complaints.
To be fair Manx refunded me the cost of the whole round trip in cash, not vouchers, which I thought was a reasonable gesture.
And I suspect the crew may well have been unaware of the closure, so the black mark should stick with those who, having embarked on a strategy, slavishly followed it despite indications that it wouldn't work. (Or maybe they knew that LPL hotac was cheaper than LHR??)