 With the delivery of the Boeing 737 @-@ 200s , Braathens SAFE started using these aircraft on the long @-@ haul charter flights . By 1977 , there were nine international charter airlines competing with Braathens SAFE : Aviaco , Britannia Airways , Dan @-@ Air , Linjeflyg , Maersk Air , Scanair ( owned by SAS ) , Spantax , Sterling and Transair . In 1976 , good exchange rates gave a peak of flights to London , with eleven weekly flights across the North Sea . Braathens SAFE also started flying for Vingresor . In 1976 , 44 % of the company 's revenue was from charter , but by 1979 it had dropped to 36 % . During this period , about half of the planes ' flying time was related to charter . 
 With the delivery of the Boeing 737 @-@ 200s , Braathens SAFE started using these aircraft on the long @-@ haul charter flights . By 1977 , <a href='dey_it' title='1'><mark>there</mark></a> <a href='uninflect' title='2'><mark>were</mark></a> nine international charter airlines competing with Braathens SAFE : Aviaco , Britannia Airways , Dan @-@ Air , Linjeflyg , Maersk Air , Scanair ( owned by SAS ) , Spantax , Sterling and Transair . In 1976 , good exchange rates gave a peak of flights to London , with eleven weekly flights across the North Sea . Braathens SAFE also started flying for Vingresor . In 1976 , 44 % of the company <a href='null_genetive' title='3'><mark>'s</mark></a>revenue was from charter , but by 1979 it <a href='been_done' title='4'><mark>had</mark></a> dropped to 36 % . During this period , about half of the planes <a href='null_genetive' title='5'><mark>'</mark></a>flying time was related to charter . 
With da delivery of the Boeing 737 @-@ 200s , Braathens SAFE started usin dese aircraft on the long @-@ haul charter flights . By 1977 , it was nine international charter airlines competing wid Braathens SAFE : Aviaco , Britannia Airways , Dan @-@ Air , Linjeflyg , Maersk Air , Scanair ( owned by SAS ) , Spantax , Sterling and Transair . In 1976 , good exchange rates gave a peak of flights to London , with eleven weekly flights across the North Sea . Braathens SAFE also started flying for Vingresor . In 1976 , 44 % of the company  revenue was from charter , but by 1979 it done dropped to 36 % . durin dis period , about half of tdaplanes  flying time was related to charter .