I never thought this would occur if a merger is approved, but the below reads like a combined US Airways/American will be named American Airlines.
http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_04_20_2012_p0-450491.xml
http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_04_20_2012_p0-450491.xml
(I know I would be seriously tempted to do same.)