A It is not necessary to refine the scale of language proficiency within realistic scenarios.
B It is pointless to monitor and extract relevant data from the communications of pilots and air traffic controllers.
C There is an urgent need of highly-specialized equipment to simulate the workplace context for pedagogical purposes.
D There must be lifelike L2 training and assessment in air traffic controller–pilot communication under workload conditions.
E There is no link between performance dissimilarities and language proficiency in the communication between pilots and air traffic controllers.