在overbooking的规则取消以前，你也有权力要cash而不要接受voucher.

下次被bump了，可以试试Airhelp。不需要你和大公司还有航警察直接对抗，但你可以不让航空公司赚便宜：

"You should never accept travel vouchers because you're entitled to more in cash," 

Those submitting claims -- which can be filed within three years of a flight -- are told immediately if they're owed money.

At that point, fliers can deal directly with the airline or have AirHelp negotiate for them, in which case AirHelp takes a 25% cut. If airlines refuse to pay or ignore the claim, AirHelp will sue. Zillmer said it has sued airlines on more than 20,000 occasions since launching in 2013.

http://money.cnn.com/2017/04/12/technology/united-airhelp-service/index.html?iid=ob_homepage_tech_pool