Originally Posted by
threeoh
In the past they have covered this, but no Covid-era data points on this thread that I know of.
You can always write the airline back and say "because crew availability was ultimately due to weather, can you write a new letter that states that weather was the ultimate cause of the delay?"
I specifically requested Southwest do this, and they still wrote Crew. Even when I asked them to redo the letter, that was again their response when they responded a month later. Honestly this seems like something that could be automated in most instances.