It is not necessary to refine the scale of language proficiency within realistic scenarios.

It is pointless to monitor and extract relevant data from the communications of pilots and air traffic controllers.

There is an urgent need of highly-specialized equipment to simulate the workplace context for pedagogical purposes.

There must be lifelike L2 training and assessment in air traffic controller–pilot communication under workload conditions.

There is no link between performance dissimilarities and language proficiency in the communication between pilots and air traffic controllers.