Some airlines also keep their own stocks of duty-free goods to sell to passengers in flight.

一些航空公司同样备有自己的免税产品，来在飞行途中向乘客出售。

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Airlines are reluctant to stop them because airport operators often use sales of duty-free and other items to subsidise landing charges.

航空公司不情愿阻止他们，因为机场运营管理商通常用免税产品和其它商品的销售额来抵充所收取的机场降落费。

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Each enter a new market, this was born in Malaysia's low-cost airlines will be to "free ticket" to buy as a stepping stone.

每进入一个新的市场，这个诞生于马来西亚的低成本航空公司都会以“免费机票”抢购作为敲门砖。

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America has signed 33 open-skies deals around the world, which free airlines to fly where and when they want without government interference.

ECONOMIST: Flying in circles

With airlines free to merge, airport slots bought and sold rather than allocated by committee, and airline bosses free to decide where and when to fly, aviation on the world's busiest international route could have become like any other business, shaped and fostered by market forces.

ECONOMIST: Turbulence in the air

Most airlines stopped serving free meals in coach on domestic flights after the 2001 terrorist attacks crippled the industry.

WSJ: Coffee, Tea, or Tapas? Critiquing Airline Fare