In early March next year DY has 97 weekly flights
in to LGW, and this is without any base aircraft. The press release from Norwegian that concerns the new Gatwick base only mention this number
With more than 100 weekly departures between the Nordic region and London
Just remember the press release came out when it was still Summer 2012 routes - the number of winter routes are reduced a bit.
Was it 300 flights out of Gatwick that was said or was it that DY will operate 300 flights at Gatwick. The latter is clearly 150 flights in and 150 flights out - and I guess that's the case. 3 aircraft and 50 flights out of LGW gives an average of 2.38 flight out per day per aircraft. Looking at the time tables, this looks like it will be the case.