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!
A little bit of extra jet fuel, a can of Coke and some peanuts.. Tips and tricks for buying miles. To make sure the purchase of miles helps pad your wallet -- and not the airline's bottom line -- experts offer these tips: First, do the math. Look at how much the miles will cost -- including taxes and fees -- and compare it to the cost of buying a ticket outright and saving your miles for later.