I had a hideous experience with Delta flying Calgary-Seattle-Narita-Taipei.
The Calgary-Vancouver flight had a serious mechanical issue, the nice gate lady found me a direct Calgary-Narita flight (Air Canada) they could get me on, but Delta refused to release my ticket in order to get me onto the AC flight.
In the words of the gate agent "Holy ####, I've never seen anyone do this before" (The Calgary-Seattle leg was West Jet, code-shared with Delta).
I ended up having to just wait a day and do the whole trip all on Delta.
Never fly Delta.
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