Thank you all for looking and for the kind comments. As for the particulars, I was shooting in shutter priority mode at 1/500, f 6.3, + 1ev, pattern metering, af-s. I've been shooting birds in flight (or trying to!) for about 3 years. From my experience it seems that all conditions have to line up perfectly. The sun has to be in the right place (rare), the tides and moon have to align etc.
But I think that is what makes the sport, fun and frustrating but fabulously rewarding when a shot is captured well. Obviously these are big crops but the focus and exposure was good enough to stand it. My two good friends are real good bird photographers and they leave me in the dust! But I do get lucky now and then.
Thanks again for looking and commenting.