United MileagePlus X

Southwest Airlines

Southwest Airlines

4.6

American Airlines

American Airlines, Inc.

4.6

Hawaiian Airlines

Hawaiian Airlines

4.6

United Airlines

United Airlines

4.6

JAL（国内線・国際線）

Japan Airlines Co.,Ltd.

4.4

Icelandair

Icelandair

2.3

Amtrak

Amtrak

4.0

Allegiant

Allegiant Travel Company

2.7