Both DL and CO announced new RJ service at LGA today. (DL +5 now and CO +22 in the future) Lots of SE cities but CO is going into JetBlue cities first.
For DL:
http://biz.yahoo.com/prnews/000316/ga_delta_n_1.html
For CO:
http://biz.yahoo.com/prnews/000316/ny_contine_1.html
Looks like U is under attack.
BSL