OK, it's been 28+ hours since I posted the question. Skatterbrane KNOWS the correct answer but won't post as he doesn't want the ball passed to him. B-Squared got HALF of the answer (Waylon) but didn't fully answer. Therefore, I'll give the complete answer and ask a new question (hopefully an easier one for you guys).
The correct answer is Merle Haggard. Merle wrote "Honky Tonk Night Time Man" (on Street Survivors) and Ronnie reworked the song into "Jacksonville Kid" (on the expanded edition of the album). Tom Dowd was planning to produce a country album with Waylon, Merle and Ronnie. It was going to be a side project after the Street Survivors tour was completed, but the plane crash killed everything. Oh, the line in "Railroad Song" that mentions Merle is "...I'm gonna ride this train Lord, until I find out, what Jimmie Rodgers and the Hag was all about..."
NEW QUESTION:
Prior to the Skynyrd plane crash, what famous rock band had used the same plane (they sold it to record company for the Skynyrd tour).