Often different genes can interact in a way that influences the same trait. In the Blue-eyed Mary (Omphalodes verna), for example, there exists a gene with alleles that determine the color of flowers: blue or magenta. Another gene, however, controls whether the flowers have color at all or are white.
The regular price of buying miles from American is about 3.17 cents per mile ($29.50 per 1,000 miles plus a 7.5% Federal Excise Tax) â before a $30 Processing Charge per purchase â but with the maximum bonus offer, itâll actually drop your price down to just 2.02 cents per mile!
American AAdvantage miles are some of the most valuable airline miles out there. Personally, I think their best uses are for long-haul premium redemptions (like my spring trip to Sao Paulo in first class on their brand new 777-300) or for off-peak awards like 40,000 miles to Europe in coach.