They do not know the market and do not understand it. They do not understand the brutal competition from foriegn, mostly state-owned carriers, who are able to and do offer something "grand". American carriers know they can not be an Emirates, Virgin Atlantic, or Singapore, but they need to hold thier own or get creamed. The domestic market is over save for a few surviving legacies, and mostly point to point (real) LCC service. US Airways has the highest costs in the industry, its ticker symbol is a joke, they will never be an low cost carrier, they are a network legacy carrier. International is where the money is for legacies- still attracts a premium and no LCC competition or even the possibility of it.
They don't understand that US Airways has a huge advantage and disadvantage in the transatlantic market. 40% of TA travelers originate east of the Mississippi. US Airways is the biggest airline east of the MS, carrying more passengers through two major hubs, and has extremely valuable slots and real estate in some of the busiest airspace in the world. They have a hub in a major US port city that is geographically a perfect gateway, has high demand for intl travel, and lucrative cargo.
They have the disadvantage of being a very late player to the game. They are historically known as a short haul airline, not an international carrier. They by far have the smallest intl presence of the Big Six, with no South America, and are the only with no transpacific service at all. They have the disadvantage of a poorly set-up hub airport and uncooperative city officials. They have a miniscule fleet of only 19 widebodies, by far the smallest of the majors, 10 of which are ancient 767-200s. Thier transatlantic gateway sits between New York and Washington, two even higher O&D markets. The New York market, an hour away, is the number one gateway to and from Europe in the country. Finally, again, highest costs in the industry, so US Airways needs to charge the same or more than it's US competition for both it's economy and premium product.
This is an airline that needs to pull it's socks up and start competing. They cannot be an LCC, and they are the lamest duck of the Big Six.