On Friday US Airways shareholders approved the proposed merger with American Airlines.

The move is one step closer to creating yet another mega airline, after Northwest merged with  Delta, Continental took over United, and AirTran merged with Southwest.

If the deal goes through, American Airlines --which is undergoing bankruptcy proceedings -- will effectively be taken over by the smaller US Airways. The new firm will be owned by a blend of US Airways shareholders and American Airlines creditors.

Critics of the prosed plan say that it could raise fares, degrade service and eliminate consumer choice, especially from smaller airports. But executives from American and US Airways both say they expect a green light on the merger.

Here’s what you need to know about the proposed merger: