My nightmare flight was Manchester-Zurich-Johannesburg on Swissair in 1999.
They subcontracted the MAN-ZRH legs to a firm called Flightline of Stansted, using BAe 146s.
Despite their plane being on stand at MAN, the crew were "out of hours", so we were rebooked on BA to Frankfurt, then SA on to Johannesburg.
Except Frankfurt had air traffic delays so we never made the SA flight and found ourselves stranded in Frankfurt as guests of BA, in November.
They found us an off-site hotel (same one the airline crews use), but the bar was shut, no room service, and only German cash (DM) accepted, of which we had none, and they had exceeded their foreign currency conversion limit for the day!
We were rebooked on Crossair to ZRH and then SR's day flight to Johannesburg, an itinerary I had to persuade them to use.
It snowed overnight, with us being largely in tropical gear for South Africa.
More delays having to de-ice the LX plane, but we then did make the ZRH connection, but having lost a day's holiday.
We have been rerouted several times since, but none as user-unfriendly as that.
All down to Flightine's crew problems at Manchester.
Oh and on the train to the airport (Crewe-Airport express 153 on Central), we were turfed out at Wilmslow as the Airport branch was shut for some emergency reason. Luckily the railway picked up the taxi bill, and we didn't lose significant time.
So on the whole a jinxed trip.
I would never fly Flightline again - maybe they have become Avia Blue Flightline, an aviation services company at Stansted.
Best flight ever was on an Air New Zealand Fokker F27 (big windows, flies low and slow) from Christchurch to Invercargill.
This has a high wing which nicely eclipsed the westering sun, allowing perfect views of the Southern Alps on the way down.
At Invercargill, they announce "Welcome to the Deep South".
In the past I have landed at Farnborough while a guest on the MoD's internal airline (Dove aircraft).
Latterly I've mostly flown easyJet on short haul from MAN/LPL.
I used to use KLM a lot for long haul, but as Australia is our main destination these days (family) we tend to go on Singapore (ex MAN).
I refuse to route via any of the London airports.
Next flight is on Jet2 to Kittila in Finnish Lapland in February - should be interesting.