US Airways was approved formally to join the Star Alliance according to a unanimous vote of the group's chief executive board. The addition will increase the number of airports serv on the network from 700 to 771 while the number of countries serv will extend to 133 from 128. US Airways has been working with Star member airlines since it signed a codesharing agreement with United Airlines in 2002 It not long ago signed a similar MOU with Lufthansa. While