Originally Posted by SW7London

I wonder if departures such as these come out of the Heathrow Night Flight Quota? If so, seems unfair on other airlines? (i.e. Ones who spend the money on keeping their IT systems online - that the night quota is used up because BA cant get its house on order!)

Or is an event such as this considered exceptional(like severe weather?) that delayed departures such as this are not considered part of the night quota?