The main purpose of the research presented in the text is...

compare the level of L2 proficiency of pilots to that of native language speakers.

discuss the consequences of miscommunication between air traffic controllers and pilots.

comment on the effects of high cognitive overload on air traffic professionals who are native speakers of English.

investigate accentedness, comprehensibility and fluency in L2 controllers and pilots communicating among themselves.

report on the effects of L2 proficiency and workload on speech production and retention of information in pilot-controller interaction.