Prepare to pay more if you're flying soon as the nation's airlines, struggling with higher fuel costs, boost fees for everything from letting...

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Prepare to pay more if you’re flying soon as the nation’s airlines, struggling with higher fuel costs, boost fees for everything from letting children fly alone to booking frequent-flier travel on the phone or checking a second piece of luggage.

Delta Air Lines, the nation’s third-largest carrier, is the latest to hit customers with a long list of new fees. Delta’s are effective today.

The airline boosted its unaccompanied-minor fee — the charge to transport a child between the ages of 5-14 flying alone — from $50 to $100 each way on a nonstop flight, the same it has been charging for connecting flights.

Frequent fliers will be charged a $25 “handling fee” for award tickets booked over the phone with a Delta representative that include a segment on a partner airline, such as Alaska or Northwest. That’s on top of an increase from $20 to $25 for booking any type of ticket on the telephone.

Delta, based in Atlanta, also said it will boost the charge from $75 to $100 for taking a pet in the cabin, and will raise the cost of taking an oversized bag from $100 to $150.

Northwest, United Airlines and Delta announced earlier that they would begin charging some domestic passengers $25 each way to check a second bag.

Northwest’s fee for children traveling alone on connecting flights also goes up to $100 for tickets issued after today.

Alaska Airlines, the biggest carrier serving the Seattle-Tacoma area, so far does not charge extra for checking a second bag. Its fees for transporting children are $30 for nonstop travel and $60 for connecting flights.

Northwest and Delta revived merger talks recently as oil prices have soared, putting pressure on the airlines to consolidate to cut costs.

Carol Pucci: 206-464-3701 or cpucci@seattletimes.com.