My nearest airport is Norwich (NWI). KLM staff in Amsterdam generally know that it's pronounced "Norrich", but in most other places they will insist on telling me that my bag has been checked to "Nor-witch". Can't really blame them, I guess.

(Oh, and just to confuse the issue, there is another pronunciation, "Nah-rich", which is used (a) in Norfolk dialect and (b) by people making fun of Norfolk dialect)