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These days, plane tickets include less and less in the price -- that is, if you plan to check in a few bags, sleep, eat, stretch your legs or watch movies during the flight.

Sorry, folks. Convenience now has a price tag.

Paying for amenities that used to be free might seem outrageous, but the practice is not exactly new to major airlines, according to Randy Peterson, an expert on frequent-flier programs and editor and publisher of Inside Flyer, a magazine for frequent travelers....

...But today, the practice has become widespread. Munchies and movies now come with a price tag on longer flights. Hunger pangs on a five-hour United Airlines flight will cost you $5 for a salad or sandwich wrap with chips. Desire to watch the in-flight movie "Walk the Line"? It will cost you $5 for the headsets on US Airways flights.

Nor can you pack everything but the kitchen sink -- unless you plan to pay the excess baggage fees. Though you could once check in two bags for free, now many legacy carriers limit each bag to 50 pounds and 62 linear inches -- and still cap you at two free checked-in bags. You don't want to break the rules, either. Overweight bags will cost $25 to $50 apiece on domestic American Airlines flights. Oversized bags will cost $80 a bag, and extra bags will cost $80-$180 on the carrier.

t's also a bad time to be tall. Those wanting more leg room in a preassigned aisle or emergency exit row seat on a Northwest Airlines flight will pay $15 for the once-free privilege.

Despite the recent press, Northwest's move is not entirely new, says Peterson. United Airlines has been charging for premium seats for years -- they just introduced it better...

How much worse could it get?
If leg room, food and movies have a price tag, it makes sense that other once-free services might soon come with one, too. Some freebies the experts think might cease to be free include:

* Curbside check-in. Legacy carriers could charge around $2 per bag, says Miller. (American Airlines has already started the practice.)
* Beverages. Trippler predicts legacy carriers will charge for sodas, juice and bottled water at $1 to $2.
* Checked baggage. Trippler expects consumers to pay somewhere around $2 to $5 per bag. He says the fee will probably cause people to pack more into their carry-on luggage, leading to stricter enforcement of carry-on baggage limits or perhaps fees for carry-on luggage.

Most of the fees consumers will just stomach, Trippler says, noting that consumers have been conditioned to pay fees. Consumers generally pay $15 more to buy tickets at the airport versus buying them on the Web, and they'll also pay a premium for paper tickets. On some airlines, they've already gotten used to paying for junk food, sometimes paying $5 for a snack box full of junk food