The Ferris Air Easter Eggs in Arrow and The Flash appeared to be pretty meaningless, but the mention of a missing test pilot in last night's episode was very interesting indeed. Green Lantern isn't set to reach the big screen until Justice League Part Two (rumour has it that he won't show up until the very end of the first movie in that franchise), and his solo movie is still five years away. With Barry on TV despite the fact that Ezra Miller has also been cast as The Flash, there's nothing to say Hal Jordan can't join him and Oliver, especially as John Stewart is rumoured for the movies.
Of course, we haven't heard anything about this happening, but I wouldn't be at all surprised if Hal shows up in Arrow or The Flash later this year to set up a solo series in 2016. The latter has certainly shown that small screen special effects are capable of bringing a character like that to life, but we'll just have to wait and see... As always, be sure to share your thoughts and theories below.