I can't speak for the Mec or the company. What can be said is that the company is optimistic in numbers, the Mec is conservative in numbers, and in the end folks look at numbers a bit differently. 17 lines is the pure revenue for the company, 21 planes is where the staffing comes from. Who will say what? Company- 17 lines of flying, union 21 planes. DL paid for 36 refurbs, without any factual evidence that would be the number of airframes desired. I do know hours are being turned away due to staffing by pretty much all the dci's, so it comes down to who can staff what right now.