Strategic alliances are common to any industry. Their presence is felt quite significantly in the airline industry. Starting in the US in 1978 deregulation of airline industry has since brought about sea changes in functioning of the industry. This paper attempts to understand the developments and strategic alliances that have occurred in the airline industry since deregulation. These strategic alliances exist in various forms and differ widely in scope and no consensus on classification was found. The advantages and disadvantages of strategic alliances with respect to the airline industry have been discussed. It is felt that the industry is getting increasingly concentrated. However, no conclusive remarks can be made about consumer welfare.