[PIF]

Is that were the ultralights are going? To establish a new flock, separate from the other ones?

[amorphous]

I don't know for sure. Perhaps more can be learned from this documentary about it:

Flight of the Whooping Crane (1984)

Storyline

This documentary follows the migration of the endangered Whooping Crane from its wintering grounds in Texas to its nesting grounds in Canada's Northwest Territories. The film follows a group of wildlife biologists who are tracking the cranes using radio collars. The film includes beautiful images from the ground and stunning aerial photography of a crane family as they make their way northward on a perilous 3000 mile journey. The film is eloquently narrated by the late John Huston. Written by David F. Oyster, Producer/Writer