请问有经验的长老知道航班被无理由改了时间怎么办吗？
原订的Frontier Airlines
From Indianapolis Intl Airport (IND)
Indianapolis, IN
Departs: 4 PM
To Denver Intl Airport (DEN)
Denver, CO
Arrives: 5 PM
From Denver Intl Airport (DEN)
Denver, CO
Departs: 6
To Los Angeles Intl Airport (LAX)
Los Angeles, CA
Arrives: 7
改成了前半段一样，后半段为
From Denver Intl Airport (DEN)
Denver,CO
To Los Angeles Intl Airport (LAX) Departs: 9
Los Angeles, CA
Arrives: 10：54PM
下面是The priceline.com Customer Service Team的邮件：
Airlines adjust flight schedules for various reasons; this is a common practice. We have sent this notice as a courtesy and since your airline can continue to change flight schedules, please call the airline to confirm your flight information prior to each departure.
查过前一个航班的票还在卖，只是贵了100多刀，遇到这种情况怎么才能要求把航班调回来？谢谢
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我之前也收到过航空公司发来的类似的邮件，说航班被改到第二天了，后来打电话过去问才知道是联程的头一段晚点，导致第二段不得不改成另一班。