Originally Posted by
Babu
If you are a coach flyer, I would go with American. You would make Executive Platinum flying the LHR-MIA-PTY route roundtrip once a month. With Executive Platinum, you would receive 8 one way systemwide upgrades--so 33% of your trips could be upgraded without using miles + cash.
Will the OP qualify for free upgrades as an EXP flying MIA-PTY? AA seems like a no-brainer here but 8 VIPs only upgrades 4 out of 12 round trips, so giving up upgrades on the USA-PTY segments might influence the OP's decision.