Well, my experience is that most domestic flights (regardless of country or continent) have poor seating, terrible service etc. and most international flights (regardless of airline, country etc.) are much, much better. Of course, there are many exception to the above observation but on a general sense, airlines tend to (for good reason) devote their energies to intl. flights. I don't believe that there is a strong correlation between price and service - in reality a BA flight within the EU often costs about the same as a London to Toronto and the trans-atlantic segment has vastly better service than the domestic (within EU) one. Another personal experience would be Thai Airways within Thailand compared with Thai internationally there is a huge quality difference.