Originally Posted by percysmith

You need $5,000 in any phase *you want to earn extra miles under the promotion in*. You can't spend $5,000 in last phase and $10 in this phase and expect to earn $5/mile in this phase on the $10.

8,000 *extra* miles

Overseas earn (Prestige and Premiermiles): $2/mile total = $4/mile normal + $4/mile extra
Max spend = $5,000 + 8,000x4 = 5,000 + 32,000 = $37,000

Local earn (Premiermiles): $5/mile total = $8/mile normal + $13.33/mile extra
Max spend = 5,000 + 8,000x13.33 = 5,000 + 106,666.67 = $111,666.67

Local earn (Prestige): $5/mile total = $6/mile normal + $30/mile extra
Max spend = 5,000 + 8,000x30 = 5,000 + 240,000 = $245,000