Eagle-eared reader David of Williamstown spotted this one.*
David wasn’t sure about who coincided with whom, because both songs were recorded in 1981 (the Air Supply track was released mid-1982). But while they were both recorded in 1981, I’m inclined to think that the Air Supply track was recorded very late in 1981 (otherwise why record it early in 1981 when you’re popular and then release it almost a year later when there’s a fair chance you won’t be that popular anymore?). Christopher’s song, on the other hand, was first heard in the film Arthur when that was released on July 17, 1981. As a result, I reckon Air Supply
borrowed from coincided with Christopher Cross, not the other way round.
Anyway, here are the full versions from today’s shenanigans: