Another outstanding guide, thanks c-w-s.

One question - although you note (with some exceptions) that the same aircraft turn round at ORK/SNN for the LHR runs making back-to-backs doable, is it not possible that if an LHR-ORK/SNN flight is cancelled say due to weather, EI may still run the following ORK/SIN-LHR service using a spare aircraft at the base? If so would this not add some extra risk compared to using BA to DUB?