When I flew for Comair we flew JFK-AUS, JFK-DFW, and JFK-IAH on the CRJ-900. They are all too long for an rj, especially JFK-AUS that was blocked at 4:20. The only good thing was you could take a full load of people and a full tank of gas an not be weight restricted.

It seems like anytime Delta adds a new route it is always rj service.