I suspect the 220 delivery issues are engine driven. GTF engines are in such short supply that the current lease rate for a P&W GTF engine is 200,000 a month! They are scrapping 6 year old A321 NEO’s to pull the engines off and lease them. Delta had some narrow body leases in the past for 10,000 a month including engines! Fortunately Delta is probably in the best position of any of the users but the engine market is crazy.