Just because MCO is a focus city does that allows for connections not make it any less random then AUA (from HPN). I am not saying HPN-AUA would make sense. But, for example, if JetBlue determined that say PWM-PIT or RIC-AUS made business sense, then it's not really random.

HPN-AUA
 

CO has a 1x week flight from LGA to AUA then perhaps there may be a market for the HPN-AUA flight.

HPN has an hourly passenger cap that's part of the airline lease agreements. The terminal was also deliberately grossly underbuilt so that there's a natural restriction on the number of passengers that can fit in the secured area at any given time.

B6 would just have to find a time for the flight when the hourly passenger cap isn't already maxed out. A 1x weekly Saturday service should easily fit somewhere, if that's what B6 is envisioning. A daily service, perhaps not.