bealine - when an airline orders a new aircraft from the maker both sides sit down and hammer out a contract, no two companies are likely to have the same contract.
One company may want six crews per aircraft trained at the makers facility, another company may say they will do their own training but want an upmarket galley fit, etc. etc. etc. so it is quite possible that an agreement about downtime in, say, the first year will be reached too. Both makers and airlines are very secretive about their deals!