By a majority, the Court of Appeal has held that an airport operator’s obligation to use best endeavours to promote an airline’s low-cost services gave rise to an enforceable obligation to operate outside normal opening hours, as this was essential to the airline’s business model. The airport could not escape this obligation on the basis that to comply would be unprofitable: Jet2.com Limited v Blackpool Airport Limited [2012] EWCA Civ 417.
Clauses requiring the use of ”best”, “reasonable” or “all reasonable” endeavours to achieve some objective are commonly used in commercial agreements where a party will not accept an absolute obligation. Their precise meaning is, however, open to a great deal of debate. This decision gives further illustration of the potential uncertainties. Where a clause is broadly drafted, it may be difficult to predict in advance not only what is required to fulfil the obligation, but whether it is sufficiently certain to be enforceable in the first place.
Some practical implications of the judgments include:
- Given the uncertainties, the drafting of such clauses should be approached with great care.
- Where possible, it may be best to specify what steps a party is required to take (or not take) in order to comply with an obligation, or at least set some criteria by which a party’s endeavours can be assessed.
- Parties should give careful consideration to how they perform an agreement in practice. Once the status quo has been established, a party may be called upon to justify any departure from it. Continue reading


