I noticed in the cities served chart EYW shown, got excited thought maybe B6 started service been when I plug in a request for fare from EYW-CLE I see Silver Airways operates the EYW portion. After my last terrible experience with them no thanks I would rather drive to Key West from FLL.
This would be a good route for B6 but the short runway is probably an issue even for the regional jet. Delta does still fly a 737 to EYW.