Bobdmac quoted:
Nestlings fledge in 42 to 46 days. Males
fledge earlier than females.
Well, normally, but Thunder is now 53 days old, and I don't think what happened last night was a fledge.
Pooky - I am no expert but I think that redtails are rarely banded. If one is captured for whatever reason, it may be banded before it's released. Last year Palemale, Jr., and Charlotte's hawklet fledged off of a high ledge on a building in New York City. It landed in the street and was picked up and sent to a wildlife rehabilitator. When he was released in Central Park a week or so later he had been banded--and fortunately his parents found him and began feeding him.
Peregrine falcons were an endangered species. Many were raised in captivity and then released in areas where it was hoped they could establish-or re-establish--a population. Those falcons are always banded before they are released, their nests are watched, and new chicks are banded whenever possible. In the Chicago area, we now have a host of peregrine nests. One is on the Metropolitan Correctional Center (federal prison) downtown. For some reason, the officials won't let people up there to band the chicks.

Peregrines have adapted to the cities very well and were taken off the endangered species list.
I think it is a similar situation on the Channel Islands off California with eagles. They had died off there and are being re-established so I would guess that's why they are tagged. Here's a wonderful video of an eaglet being returned to the nest. Note the helmets on the two people--for good reason:
http://s165.photobucket.com/albums/u77/eaglegal_2007/?action=view¤t=FosteringWEChick08.flv
Sorry, I can't figure out how to creat an actual link.