That's a US Domestic only program, and it requires a week long training program to get certified, at your expense. The guys who do carry in the US are not allowed to take their guns out of the country. Remember this incident?


http://www.cnn.com/2008/US/03/26/pilot.gun/index.html

We do have Federal Air Marshals who fly on select International flights however. When they arrive into another country, they have to put their guns/ammo in lock boxes and turn them over to the local authorities while they layover, then pick them up on the way out. I don't think any other country, except maybe Isreal, has an 'Air Marshal' type program.