How many of the Airbi and Boeings coming down the production line are purchased by lessors with no definitive customers? Just read GECAS ordered 30 ATRs, I don't know but I wonder if they're really for anyone anyways? Delivery slots do have value of you resale at a premium.
fwiw, when it comes to new aircraft orders I worked on an order when I was the CP for a corporate operation. First, the Embraer Legacy the boss owned was acquired while already on the production line when someone backed out. Evidently happens all of the time and sometimes you're stuck with options you didn't want sometimes you're not. Now the boss ordered one of the new Phenom 100s to augment his jet. At the time a lot of people and companies were buying positions for the 100s in the hopes of holding them up until they had to make progress payments and then selling them for a premium (read double) to a real buyer who was too impatient to wait through a rather sizable backlog.
That ticked Embraer off as they incorrectly saw that they could've made more money up front by increasing the prices of their positions. The boss had ordered one of the new EMB-500s to replace his Legacy but when those prices went up he dropped the 500. If you go online you'll see about 27+ Phenom 100s for sale. Many are future positions as this game of securing one and then selling it for a premium backfired simultaneously with the house flipping craze.
Thats my two cents.