PARIS, June 24 (Reuters) - Airbus CEO Guillaume

Faury said supplies of engines for its best-selling A320-family

of narrow-body jets had deteriorated "significantly" in recent

months, one of several factors that prompted the planemaker to

cut output forecasts on Monday.

Faury also told reporters that an uncertain outlook for the

industrial commitments of aerostructures maker Spirit

Aerosystems ( SPR ) had contributed to the decision.

He declined to comment on the timing of a widely expected

deal to acquire Spirit assets related to the A350 and A220 jet

programmes as part of a carve-up of the supplier with Boeing ( BA )

, which sources have said they expect in days or weeks.