Plane Down in Hudson River - NYC

[nunki]

Geese Migration Routes

Adding to the response of TeachMe:
(SLF only).
Geese learn their traveling routes from their parents. Thus, the ways they travel have been established over some considerable amount of time. Also, they have determined travel seasons, mostly two times per year, according to seasons. Monitoring of the flocks and their migration behavior surely already is done by ornothologists, for example here. Can it really be that difficult to regularly pass these observations on to whom is concerned with the security of (civil) air traffic?