For one dollar charge from MCI you'd receive:
From MCI: 5 miles
From DL AMEX for charging your bill to a DL AMEX: 2 miles
From DL AMEX during "Double Miles" promotion: 1 mile
I don't believe you are correct about receiving 7 miles from MCI, you only receive 5 miles from MCI and then 2 miles from DL AMEX for a charge from MCI, then 1 mile for the "Double Miles" promotion, which if you read my post under AMEX (
www.flyertalk.com/forum/Forum69/HTML/000070.html ) I explain that their "Double Miles" promotion is really "1 Bonus Mile per Dollar".
[This message has been edited by Beckles (edited 05-20-99).]