An onboard movie used to be a perk of every transcontinental and overseas flight (even if you had to crane your neck to see them on those screens spaced along the aisle). Now the screens are more often on the back of your seat, and the offerings have multiplied — but you've got to pay for the headset needed to view them: $2 on American, $3 on Continental, $5 on US Airways. (On United, they're still free.) And the Everybody Loves Raymond reruns haven't improved.