Question on those aircraft orders, deferrals, etc... for those of us that are new to civilian flying.

It looks like the company has 38 aircraft on order through 2018. Can they defer any of these (like they just did recently with other aircraft)? Can they cancel any of these?

The higher ups at the interview made it seem like the E190s on the books for delivery later, will never see the light of day.

Just looking to learn more about the order process, and take any predictions.