Originally Posted by
ktremor
Flying Blue- 180 days
Air Tran-180 days
BMI-1 per calendar quarter
Continental- 180 days
Delta- 180 days
Frontier- 1 per calendar quarter
Mexicana- 1 per calendar quarter
NWA- 180 days
US Airways- 180 days
Virgin Atlantic- 1 per calendar quarter
Priority Club- No Limitations
HHonors- 90 days
BA Exec club is not one of the current partners.
I'm pretty sure that Delta is once per quarter -- not twice per year. I went back and confirmed that I redeemed e-rewards twice in a 4-1/2 month span.