In 2017 we were 11 hours late arriving in Athens from Glasgow due to a technical fault with our KLM flight which resulted in the flight being canceled. They managed to get us on British Airways via Heathrow and we finally arrived at our hotel at 2 AM. That time I didn't know that I am eligible for compensation but my brother told me that I can claim compensation from airlines. I checked some online resources and here: https://www.claimflights.co.uk/airlines/klm-royal-dutch I found that I can claim 400€ from KLM. I wrote a letter to airline asking for flight compensation they responded within 3 weeks, sent me compensation in my bank account.