Is it true that swifts after leaving a nest take off and stay airborne from one breeding season to the another breeding season. Do they really stay all the time in the air? How do they maneuver and can they feed at night? Do they use echolocation? How high swifts fly during night time?

certainly for up to 6 months. see:
http://www.nature.com/ncomms/2013/13100 … s3554.html

http://www.newscientist.com/article/dn2 … ZJA_hujNcY