>_< I hate this tool so much.

Looking at JFK-CLT in mid Oct. Expert Flyer reports 6 ex JFK and 2 ex LGA flights with the required fare class available (x2 for US/AA codeshares, all A6 or more).
Tool offers 1 flight.

It still refuses to show codeshares that exist and are available (eg, AA7974 [QR722]).