pancho [1] filed a deletion request for concourse-fly [2]: Superseded by https://aur.archlinux.org/packages/concourse-fly-cli, which is nicely maintained (multipackage providing both concourse server and fly cli, and kept up-to-date when upstream releases happen, which we fail to do with this package).
[1] https://aur.archlinux.org/account/pancho/ [2] https://aur.archlinux.org/pkgbase/concourse-fly/