Other cities can be booked into October 2019, STL and PIT only through March. That's not a good sign, is it?
IIRC, didn't the airport require them to commit to the route for a couple years in exchange for the incentives?
I don't know if it means much, it is kind of all over the place. SFO got cut for winter and it is bookable for May. MCO you can't book past April. Most routes cut for winter you can't book for summer yet. It is mostly just big cities that run daily or mostly daily that are open all the way thru summer so far. I figure those have pretty set schedules year round that make it easy. I am not concerned about it getting cut for summer, Jan-March, we'll see. Maybe with their money issues they are re thinking having a RON in STL during winter.
They aren't really giving them any incentive payouts. It just waived landing fees and are doing marketing, so if the flight did end they would just stop. I think it is for a certain number of flights a year, so they could just load up on summer flights and cut winter to still get them.