I did not get too many good opportunities to catch these birds in flight as they were quite often far out. Here is my favorite shot of one in flight. Other than swooping by us it never once flew towards us or looked at us at all while it was actively hunting. Snow had let up here a little as compared to my previous shot.
Canon 1dx and Canon 500 f4 ii + 1.4xiii. Tripod mounted. ISO 2500, f 6.3, SS 1/1600.
Converted wit DPP 4.5. In PS I added a little canvas all around. Sharpened and applied NR to bird and background. Hope you like it.