租车用了coupon就不能用AMEX的premium的租车保险了?

之前一直用这个amex的premium car rental insurance,今天偶尔在flytalk上看到不少
人提到如果你租车用了不是amex来的保险, 比如说1 free day或者dollar off, amex是
不保的, 因为amex认为这样你就没有用amex 卡付全额, flyertalk上还真有人因为这个
claim被据了.
有谁清楚这是咋回事? 如果真是这样, 那amex的保险屁用没有啊, 这年头租车
还有不用coupon的?

Premium Car Rental Protection可以
AMEX Car Rental Loss and Damage Insurance Plan不行
http://corp.americanexpress.com/GCS/Intl/IDCEN/CorporateCards/D
NEN.pdf
AMERICAN EXPRESS CARDMEMBER CAR RENTAL LOSS AND DAMAGE INSURANCE PLAN
How To Activate Coverage
Coverage for theft of or damage to a Rental Auto is activated when the
Cardmember:
1d. uses the Card to pay for the entire auto rental from the Rental Company at the time of vehicle return;

http://www.proandcontracts.com/wp-content/uploads/2011/03/2011.
press-Premium-Car-Rental-Policy.pdf
PREMIUM CAR RENTAL PROTECTION
How to Activate Coverage
Coverage is activated when the Cardmember uses an Enrolled Card to pay the
rental fee for the Rental Car and the Cardmember signs the rental agreement
for that Rental Car.

这个帖子说的不是这样的, 他是付钱的那种:
http://www.flyertalk.com/forum/11897813-post19.html

这个也问了amex,说不能用coupon:
http://www.flyertalk.com/forum/13979622-post23.html
但这个又说amex的email说可以:
http://www.flyertalk.com/forum/13995293-post28.html
真是混乱啊

这个帖子说的不是这样的, 他是付钱的那种:
http://www.flyertalk.com/forum/11897813-post19.html