Cash-strapped airlines are jumping on the a la carte bandwagon, charging for services that used to be bundled into the cost of a ticket.

According to the International Airline Transport Association's estimates, every dollar jump in oil prices generates an additional $1 billion in fuel costs for the airline industry.

Rather than raise fares and appear uncompetitive on pricing, airlines are imposing a multitude of fees as additional sources of revenue. Passengers are increasingly irritated by being dollared to death at every turn, as the friendly skies become the spendy skies.

These new and ever-mounting fees — already a point of contention between passengers and airlines — will surely affect your summer holiday budget.

There are 10 fees that are particularly annoying to the flying public, and some may come as a most unwelcomed surprise.

1.Telephone bookings. Airlines have determined that channeling bookings towards their Web sites saves operational costs. To push the public in the desired direction, they charge extra for booking by phone with a live ticket agent, although many of their award and more complicated tickets can only be purchased through an agent. Phone-booking fees are running up to $25 but may be waived for some upper-elites registered in a frequent flier program. Always ask if the itinerary the agent outlines can be booked online, the only fee-free means to purchase a ticket.

2. Second bags and oversize luggage. The number and weight of bags in the cargo hold has a direct impact on the amount of fuel an aircraft uses. Several airlines in the U.S. now charge passengers $25 each way for checking a second piece of luggage. And if your one "free" suitcase tops an ounce above 50 pounds, you'll be slapped with a $50 to $80 overweight fee. On top of all that, American Airlines said on Wednesday that it plans to charge $15 to check just one suitcase on a domestic flight.

3. An indecent meal. Continental remains the only U.S. legacy carrier still serving complimentary meals in coach class on flights of two hours or more. Pay-to-eat on domestic flights seems to be a new fixture of flying, from $2 chips to $5 snack packs and $10 sandwiches. Expect to be charged for soft drinks if oil continues to climb.

4. Better seats. Airlines are moving to smaller aircraft to cut fuel costs and fill flights, which means extra space is a precious — and pricey — commodity. If you want to choose seats with more leg room, at an exit-row, by a window or on an aisle or even to choose any seat in advance, be prepared to pay $5 to $35 to some domestic airlines for the privilege. You'll be happy to note that so far there is no surcharge for sitting in that much-loathed middle seat.

5. Kids traveling solo. Some 20,000 minor children will fly alone this summer. And their parents will be paying higher airline fees to ensure a safe and timely journey from Point A to Point B. These charges can now be up to $100 each way for an unaccompanied minor on a nonstop flight. Fees and eligibility vary by the child's age and flight itinerary details.

6. Change-of-plans. If your ticket was really cheap, it's likely nonrefundable and nonchangeable. Even pricier refundable fares are subject to hefty change fees — $50 or so — plus any difference in fares between your old and new travel dates. For tickets purchased through third-party travel sites online or through travel agents, airlines charge an additional $10 to $15 to change your reservation, plus the fare difference.

7. Passenger facility charges, fuel surcharges and taxes. Nowadays the extra taxes and fees tacked on to the price of your air ticket can be quite substantial. When comparing price quotes for identical itineraries, be sure that you know the whole cost of your ticket. These additional charges vary widely and will include such categories as airport improvement, security, travel facility, fuel, federal segment and international fees.

8. Award redemption. Think again if you're planning to cash in your miles for a "free" award ticket. There are no free lunches in the airline industry. Transfer, booking and redemption fees add a minimum of $10 to your costs, plus the charge for a telephone booking, which passengers are forced to do for many awards.

9. Paper tickets. Expect to be charged $50 to $75 if you insist upon paper tickets from an airline. That e-mailed piece of paper with the printed flight itinerary known as an e-ticket is almost universal now, and it really will allow you to check in for your flight. You can get a "real" boarding pass at the airport.

10. Standby status. A convenience that many travelers once took for granted, flying standby, now bears a cost on several major airlines. Expect to pay about $25 if you want to fly earlier or later than your original flight, even if the flight is wide-open.

Irene Croft Jr. of Kailua, Kona, is a travel writer and 40-year veteran globetrotter. Her column is published in this section every other week.