frontier和spirit网上买票都有网站使用费，这部分收入航空公司可以不交税。理论上去机场买票就不用交这部分钱了。以前在SFO买frontier都很好使，就是网上价格减去网站使用费那一部分。
今天去SJC的spirit柜台买票，网站使用费确实免了，但是多加了两个额外费用结果更贵。是不是可以找DOT投诉一波？
网站买票
1 SJC - SAN $30.89
FLIGHT $4.65
TAXES AND CARRIER CHARGES $26.24
Federal Excise Tax $0.35
Security Fee $5.60
Segment Fee $4.80
Passenger Usage Charge (Non-refundable Carrier Fee) $10.99
Passenger Facility Fee $4.50
机场买票
1 SJC - SAN $36.90
FLIGHT $2.79
TAXES AND CARRIER CHARGES $34.11
Regulatory Compliance Charge (Carrier Fee) $6.51
Fuel Charge (Carrier Fee) $11.16
Security Fee $5.60
Segment Fee $4.80
Passenger Facility Fee $4.50
Federal Excise Tax $1.54