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ESP8266 RXes used as TXes can't be used for Airport since airport sends data out the TxUSB UART rather than the "main" UART, and ESP8266es don't have a TxUSB by default (or well kinda sorta but it's unidirectional in the best case so that's not very useful, now is it).
This nulls out the handset use of the main UART when in airport mode, and and stuffs airport data in/out that port instead.
TESTED=lol