They also have time to cancel tickets for free, compared with some non-refundable tickets sold on the Web.

他们还有时间免费取消机票，而一些网上销售的机票是无法退款的。

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Watch for Waste - Millions of tickets go unused, even though most non-refundable fares are valid for travel for up to a year.

虽然多数不可退还的机票的有效期长达一年，但还是有数以百万张机票最后被浪费掉。

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All fees paid are non-refundable.

所有费用恕不退还。

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ChangeYourFlight provides an alternative for these non-refundable tickets, with airlines providing a partial refund without any change fee.

BBC: New sites let you sell unused trips

Theaters and sports teams sell non-refundable tickets, but buyers can give them to friends or sell them.

WSJ: Airline Cancellation Fees and Penalties Are a Big Business

All packages are charged in full at time of booking and are non-refundable.

FORBES: Tax Day Specials, Promos And Freebies