Buyingaplanetickettodaycanbeadifficultexperience，sometimeswithalargenumberofchoicestomake，eachwithitsownpricetag．Checkingabag？Withmostairlinesyou'llhavetopayforthat---andmaybeforacarry-on．Preferanemergencyexitrow？Thatwillcostyou．Wanttoboardearlytotakeupoverheadbinspace （机上行李箱空间）foryourroll-aboardluggage？Bereadytopayoruseanairlinecreditcard．Wantacokeduringdrinkservice？FrontierAirlinescharges$1.99．Eachairline，largeandsmall，hasitsownofferingsandprices，creatingalotofotherfees．

"Thefeesaresohighthesedaysthattheactualpriceoftheticketlosesitsmeaning，"saidMaxLevitte，co-founderofCheapism．com，whichrecentlychartedairlinefeesamongadozencarriers．"Youfeellikeyou'reforcedtopaylittlebylittleallthetime．Consumersdon'tknowwhattoexpectunlesstheyreadthefineprint，whichisalotnowadays．"

Whatconsumerscallfees，airlinescallunbundling （分类计价）---makingchoicesfromservicesformerlyincludedinthefare．Airlineofficialscouchitintermsofgivingfliersmorechoices．UnitedAirlinesCEOJeffSmiseklastmonthlikenedittocustomizingapizza，"Weusedtoserveyouapizzawithallthetoppings，andthat'sallyougot，"hesaidduringaspeechatameetingoftheChicagolandChamberofCommerce．Unbundlingallowspassengerstopayforonlytheservicestheywant，hesaid．

JeanMedina，spokesmanforindustrygroupAirlinesforAmerica，saidfeeshaveaconsumerbenefit．"Themodelofchargingcustomersforservicestheyvalueandarewillingtopayforhasenabledairlinestokeepairfareaffordable，"shesaid，addingthatairfareincreasessince2000haven'tkeptpacewiththenationalinflationrate．Withouttherevenue，airlinesin2012wouldhavelostmorethan58percentpassenger，shesaid．

Thefeeincreasebeganin2008，asairlineshadtodealwithrisingjet-fuelpriceswhilenotraisingbasefares，whichwouldputthematacompetitivedisadvantage，saidJaySorenen，presidentofIdeaWorksCompany，whichregularlyexaminesairlinefees．

Tobefair，somefeesarefornewservicesnotformerlyincludedinfares---wirelessInternetairlinesaccessandneweconomyseatswithextralegroom （踏脚处），forex