It did for Paul Marr, who works for an advertising agency in Vancouver and recently found $120 in unexpected fees on his Allegiant Air ticket.

温哥华一家广告公司员工Paul就是例证，他发现自己的Allegiant Air航空公司机票中多了120美元意料之外的费用，于是试图通过正规渠道联系航空公司。

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If you book a flight today on the low-fare carrier Allegiant Air, www.allegiantair.com, you will notice that it bumps up the round-trip total by adding taxes and fees.

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The agent was smart enough to understand, and after a 15-minute hold time (where the minutes ticked by and I wondered if I would be able to make the Allegiant Air flight that was now taking off in 35 minutes), he came back and let me know a manager had approved the changes without any fees.

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An ultra-low-fare model gives carriers such as Allegiant and Spirit more flexibility in unbundling the costs of air travel, Cordle said, but other airlines will be watching the carry-on fee closely.

CNN: Allegiant Air adds carry-on fee