I understand there are delays, but unfortunately it seems to be more the norm than the exception, which in and of itself should tell the manufacturers to be a little more conservative in their delivery estimates. Telling someone it will be nine months, and getting it to them in six or seven is much better than the reverse.
I think some of these guys are looking at mortgage and car payments and college tuition for the kid and they tend to pencil in their calendars a little optimistically. And of course if they have a delivery queue it means they have work in front of them which is reassuring. When I was in the consultant biz we used to call it our "going out of business curve" the idea being you have the bookings and the work stretching out that you know will bring in checks and then after that it gets a bit hazy, people you're courting for contracts, work you might bid on if the project gets approved for some state project, that kind of thing. And each month new projects move into sight as old projects are completed. Or so you hope.
Going out of business curve of six months to a year is probably a good thing, not too frustrating for the customers and giving OEM some reassurance. The wait times for Astro-physics are of an altogether different nature. Suffice it to say they seem to sell everything they care to make.