The paper attempts to investigate the flaws in English communication between the ATC officers and pilots on air-traffic telephony. The main concern of paper is to present different kinds of dangerous situations that have been faced by the nonnative speakers of English in aviation industry of Pakistan because of their less proficiency in English. It has been perceived that the less proficiency in English of non-native speakers lead to heinous situations in flights. The International Organization of Aviation (ICAO) in collaboration with International Civil Aviation Authority (CAA) has worked on different policies to define communicative flaws between the pilots and the air-traffic controlling staff. According to the ICAO, the non-native English speakers need to develop English skills that are required for the International flights. The study affirms with an argumentation on a need to upgrade English skills in nonnative speakers with proper comprehension of English at flights. The study has been supported with references from the data collected. This study employs two tools to collect the data. 1).Episodes of the communication in telephony are collected from a documentary of communication in aviation from YouTube that demonstrates communication of native and the non-native speakers of English from two different air traffic controlling stations. The communication is exemplified in three situations, a) out of the routine b) Unusual and in c) the Emergencies. The current study focuses on the Emergency situations. 2).The group of individuals in CATI institute of Hyderabad was elicited to give their perceptions on the given episodes shown to them about the difficulty to use English. The findings have recommended that there are problems in communication of English between the native and non-native speakers of English. It was mainly due to the lack of common assumptions between them and lack of proper communicative practices. The implications were presented for the trainings of aviation staff irrespective to their own native languages.