When traveling with US Airways, if you have a mobility disability and need special seating, call 800 － 428 － 4322 at least 24 hours before your scheduled departure to ensure your needs are met. Besides seats with movable armrests, the airline also provides seats with more legroom for passengers with an immobilized leg. The airline can also provide an on­board wheelchair but let them know 48 hours in advance if you need one.

　　Southwest

　　If you're flying with Southwest and you need a wheelchair at the airport, or need other special assistance, it's best to inform the airline in advance, or as soon as you arrive at the airport so your requests can be fulfilled as quickly as possible. On each aircraft, a small wheelchair that can fit down the aircraft aisle is available at every gate and can be used if you need help for getting into your seat.

　　体裁：应用文　题材：社会生活　主题：航空公司为旅客提供的额外服务

　　【语篇解读】　本文是一篇应用文，主要介绍了几家给行动不便的旅客提供额外服务的航空公司。

　　【难句分析】　On each aircraft, a small wheelchair that can fit down the aircraft aisle is available at every gate and can be used if you need help for getting into your seat.

　　分析：本句包含that引导的定语从句，修饰先行词a small wheelchair; if引导条件状语从句。

译文：在每架飞机上，每个登机口都有一个可以在飞机过道上放得下的小轮椅，如果你需要帮助坐到座位上，你可以使用它。