Just experienced the worst flying experience ever. I booked the Swiss flight ZRH - WAW. at 12.10pm. Arrived at the gate. At 11.45, time of boarding, we are told next info at 12.10. At 12.10, I receive a notification on my phone that the flight is cancelled. But at the gate, no such info. After 5 more min., info at the gate: flight is cancelled. There is nobody at the gate, no possibility to obtain any information, what to do next, what is the plan, zero service. After 45 min. with nothing happening and 200 people stranded, we slowly decide to go to the transfer desk. There, we are told, all direct afternoon flights to WAW are fully booked, only possibility is through Frankfurt with 5 hours overlay. I decide to rebook myself for the next morning at 7am. The lady at the desk assures my luggage will be rerouted, no problem. I arrive 9am next morning at WAW and of course my luggage is not there. It finally arrived at 9pm at my hotel in WAW.
The worst in this experience is the complete lack of info and service at the gate.

Late departure (eventually 25 mins) with multiple suggested times and departure gates had me a bit frazzled. The Embraer E195-E2 (operated by Helvetic for Swiss) had adequate legroom (2+2 configuration) and was a nippy machine taking us to Zurich. I had just an hour left to clear EU passport control and change terminals, where I boarded another Swiss flight to Singapore. There was no security screen this time, unlike the serious attention paid in Berlin (my carry on bits were spread across four tubs). This international flight was a Boeing 777-300ER. It had good leg room and printed menus. The food was great.

The worst airline I have ever dealt with!
My flight was delayed and I ended up having to stay in Heathrow for the night. The airline said they were unable to book me a hotel but to book one myself and they would reimburse me. Literally 18months on I am still trying to get my money back from this. The customer service is horrific and the airline has been so underhanded this whole time. Initially claiming they couldn't pay me out the full amount as the hotel exceeded their budget (of $200??, where can you find a last minute airport hotel for $200??) When I finally gave up and accepted that was all I would be getting they decided to pretend they had already paid me and claimed it had already been sent to my account. When I had bank statements showing I had never received it they just stopped replying. I have never dealt with such a petty and underhanded company.

Where do I start?! On check in staff very rude and insisting that hand luggage checked in, despite having a disabled partner that had medication in the hand luggage.
On the journey staff are quite rude and
Then delayed flight with a connection in Zurich, staff say no problem, but got to gate for connecting flight (several other travellers too) and gate closed with no sign of staff anywhere. Airport staff indicated to go to other terminal, queue through passport control to enter EU (one passenger wasn't accepted) and then queue to see what they can do. Have to take a flight to Munich, wait 5 hours then another flight to Manchester, in total arrived 10 hours late.
Finally, no hold luggage arrived, had to wait to make a luggage claim (luggage desk saying Swiss worse airline). Luggage did eventually get traced, say it will arrive the following day (cant even contact them) and eventually arrives 2 days later.
Ask their customer services and response is 'outside of EU regulation so we won't do anything'
Worse experience I've ever had and I've been fortunate enough to do lots of long haul.

Flight was cancelled but Swiss refused any compensations according to the EU rules 261/2004 due to bad wind conditions. All other flights are done, no cancellations and we flight with AUA 4 hours later without any problems