From now until December 31st, AA is offering bonus miles on mile purchases. Additionally, the normal 40k/year cap has been lifted to 60k miles. Miles cost $29.5625/1k (inclusive of taxes) for purchases of 6k miles or more, plus a $35 processing fee on the entire transaction.
The bonus system is tiered.
| Purchase | Bonus |
|---|---|
| 5-9k | 1.5k |
| 10-14k | 3k |
| 15-19k | 4.5k |
| 20-29k | 10k |
| 30-39k | 15k |
| 40-49k | 20k |
| 50-59k | 25k |
| 60k | 30k |
As to best amortize the $35 transaction fee, purchasing 60k miles for $1808.75 yields 90k miles, yielding a cost of 2.01cpm.