What do you think is the easiest a/c to acquire in this day and age? I would make a guess at 737's. Think of all the -300's in the desert in America!
What would you say is the easiest "heavy" or longhaul a/c to acquire? Maybe 767's? KLM, EVA are just two examples of airlines who are getting "rid" of 763's.
By the way, I mean relatively newer jets, '80 onwards really, not DC8's and 732, 727's etc.