This paper aims at analyzing the Egyptian and American media coverage and official reports regarding Flight 990 from the perspective of argumentation analysis. This incident is still a matter of debate. Since the crash of Flight 990 until now, the Egyptian and American media are still addressing this incident because the exact reason behind the crash of Flight 990 is still vague. It also aims at determining the reason or reasons that caused the crash of Flight 990 depending on what has been reported by the Egyptian and the US media along with the official reports issued by ECAA and NTSB. Both sides, Egypt and US, have their own argumentation regarding the crash of Flight 990. The role of argumentation analysis is to investigate which of these arguments is considered a valid or invalid argument. Furthermore, it makes use of Wageih's model. Based on the data analyzed, there are derelictions from both sides. Egypt has relinquished its rights to investigate the accident and referred the investigation to the NTSB. The American side has jumped to the conclusion without paying attention to many other decisive factors that could change the final finding.