Canada is very easy to jumpseat from, and from my experience I always had to pay the airport taxes (usually $15-20). I would be very cautious about South America, Europe, Asia, etc. just because the person working the counter might be totally clueless. It would be a crapshoot every time. Its ALWAYS good to keep some extra ID90's in your bag for a rainy day. Theyre fully refundable if you dont need them when you get back from your trip. Never leave the country for a far off foreign destination without an ID90 as a backup in my opinion.

Also consider ACMI carriers like Atlas/Polar, Kalitta, Evergreen etc. They go to some very cool places (LAX-HNL, LAX-Sydney, EWR-Amsterdam, JFK-Brussels, ANC-HKG) and extremely easy to jumpseat with if you call or email them and list ahead of time.