YMQ is a catchall for the airports in the Montreal metro area (similarly, LON is used for London, TYO for Tokyo, NYC for New York, etc.).
In a flight search engine, YMQ will almost certainly give you flights to YUL alone (assuming you are coming from outside of Quebec).
YMQ is the code for all Montréal airports (Trudeau and Mirabel), YUL for Trudeau Airport.
Credit:stackoverflow.com‘
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