Re the earlier question, legislation and legal factors that may result in strategic changes, the European legislation regarding compensation to passangers when delayed etc. has probably had a not insignificant impact.

ESTA and advanced passenger information rules may have affected carriers to the US from visa waiver countries (people needing to book further in advance, not show up at the airport to book their flight).

Working time directive (in terms of crew scheduling etc)?

Equal opportunity legislation ?

Cabotage rules ?

Chapter 11 legislation ?