时间：2012-7-13 12:11:57 来源：环球旅讯|
travel.aircanada.com
2.26%
9
8
United Airlines
www.united.com
2.16%
7
Delta Air Lines
www.delta.com
2.12%
10
WestJet online check in
checkin.westjet.com
1.98%
-
注：数据来源Experian Hitwise
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