Looking for song from 3 days of the condor

At about 47:30 on into the movie Robert Redford turns on the radio and talks to Faye Dunaway and a song goes on with the lyrics Take a second now look up in the sky can't you see the bluebirds fly in song lyrics. Shazam and typing in the lyrics in google haven't helped.

Thanks!

Eastern Airlines became the official airline for Disney for a while in the 70s and 80s. You can hear the beginning of the song at the end of this commercial here.