They postponed the delivery of those aircraft, simply because they couldn't afford them - they realised they would have been unable to pay the bills, simple. So they wait for better times.
In the meantime, the supply us with the usual excuses : stiff competition (how new) volatile dollar (as always) fuel price (always a good excuse) civil disturbances and revolutions, terrorism (was never there before ?) fog in Dubai (easy)
Just strange they didn't mention the burned airframe after a "landing operational incident" - somebody will have to pay for it ...