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 | register for program | award chart. Average cost to buy miles on sale: 2.0-2.2 cents each. Limit to buying miles: 100,000 miles per account per calendar year (before any bonuses) Number of times per year promotion is offered: average of 8x per year.