Is it not possible to book latitude fares for international flights on AC.com? I've been looking several destinations in Europe from May-Sept and all I see for economy fares are basic, standard, and flex, and no "see latitude fare" link like there are on domestic flights. Can't say I've ever really looked for latitude fares before so not sure if this is an IT issue or just the way it is, but I've got a companion pass from my AP visa card and was thinking I'd use it for a latitude fare I can instantly upgrade.