For me in Canada it is YYZ, YUL, YOW, YEG, YYC, YYT, YVR and YHZ.

And in the USA it is BOS, DTW, ORD, IAD, IAH, SAN, MIA, MCO, RIC, CLT, BNA, ORF, BUF, PIT, PHL, SMF, CMH, CVG, ROC, SDF, LAS, MSY, PHX, BWI, CLE, JFK, EWR, LGA, DCA, AUS, DFW, ABQ, DEN, TPA, ATL, MSP, SLC