LEXINGTON, KY - DL689 wasn't the only flight taking off shortly after 6:00 a.m. in Lexington on a brisk Wednesday morning. Just as that Atlanta-bound, Delta aircraft loudly announced its presence across the way at Blue Grass Airport--you really couldn't have scripted it any better--unbeaten superstar Flightline (Tapit) was one of the first horses to train as the Keeneland main track opened for business beneath the lights. Under a snug hold and plenty eager to do more, the 3-5 GI Breeders' Cup Classic morning-line favorite was every bit as advertised,...