It's stated on the taxi chart, "Mirabel airport is intended for scheduled cargo and general aviation." I see the odd cargo plane on the ramp when we over-fly the airport. Bombardier moved some of their operations to CYMX as well.
I heard they may be turning part of the airport into an amusement park called AERODREAM. I don't know how far along this rumour is, but three years ago it seemed to have credibility.
Fact 1. The movie, Terminal, starring Tom Hanks used Mirabel as the film set.
Fact II. The Montreal Dorval VOR (YUL) is collocated near CYMX (Mirabel). The VOR YMX is to the northwest of CYMX.
Fact III. When it was built, it was the largest airport as far as surface area envisioned.
Fact IV. As far as longest "Canadian domestic" crew bus drives it took the cake. About 40-50 minutes from Dorval to Mirabel. Edmonton downtown now takes first prize as far as longest drives with Deer Lake, Nfld taking the longest in winter conditions. Halifax, N.S is third. I think the land to both YEG (Edmonton) and YHZ (Halifax) were owned by politicians and they did some serious convincing to locals. I'm certain some will say YHZ was chosen because it was deemed fog free. That's probably what the politician who owned the land claimed.
The last time I flew to CYMX was when I did touch and gos getting checked-out in the Bae 146 for Air Atlantic some 20 years ago. As well, I flew out of there as a passenger to CDG to start my initial training on Air France's A340 simulator some 14 years ago.