US Airways, American Airlines employees to rally at Capitol for merger

The companies have countered by arguing that they need to combine to be able to compete with other airlines that have been allowed to merge in recent years.

The airlines also say they have minimal overlap in their current non-stop flight schedules.

Reps. Michael BurgessMichael BurgessTrump opens can of worms with blast at drugmakers Overnight Tech: Trump meets Alibaba founder | Uber to make some data public | GOP Lawmakers tapped for key tech panels Pentagon's suppressed waste report only tip of the inefficient machine MORE (R-Texas), Robert Brady (D-Pa.), Pat Meehan (R-Pa.), Marc Veasey (D-Texas) and Robert Pittenger (R-N.C.) are also scheduled to appear in support of the proposed merger. 

US Air and American announced their intention to merge in February. The combination of the companies is estimated to be worth $11 billion.

The airlines have said they will operate under the American name, though much of the combined companies top leadership will be current US Airways' executives.