FORT WORTH, Texas, Feb. 13 /PRNewswireFirstCall/ Americann Airlines today announced it has received tentative approval from the United States Department of Transportation (DOT) for its transAtlantic antitrust immuinty (ATI) ... Their closer cooperatino, made possible by antitrust immunity, will benefit customers with more trvael choices and convenient schdeules, expanded opportuinties to earn and redeem frequent flyer miles, and greater avarilabiltiy of lower fares. ...