The expression all these trends in line 74 refers to...

‘The recent regulatory environment’ (line 56) and ‘the global economy and hard times’ (line 65)

‘forms of co-operation, alliance, load sharing and partnership’ (lines 66-67)

‘Sociological and personal reasons’ (line 71)

the professional need for a common language both in the hangar and at the ramp.’ (lines 71-73)