Fees are automatically calculated and are based on a number of factors such as the amount of traffic there is on the network and also the number of inputs.
Airbitz makes 0 profit from those fees and 100% of that goes to the miners to process the transaction.
Here is a detailed explanation on how fees are calculated, how dropped transactions work, and an explanation dust amounts that can no longer be sent. https://blog.edgesecure.co/what-are-bitcoin-mining-fees-and-dust-323d5469c572
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