Ameerican Airlines
The ticker symbol for US Steel is X and it is traded on the New York Stock Exchange.
Marlboro does not have a ticker symbol of it's own but the company's that own the brand do. The Marlboro brand is maintained by Altria in the US (ticker symbol MO) and Philip Morris International (ticker symbol PM).
Bayer trades in Germany under the ticker symbol BAY.It also trades in the US on the Pink Sheets using the ticker symbol BAYRY.
GUM is not the ticker symbol for any publicly traded company at least in the US.
The ticker symbol for U.S. Bancorp is USB and it is traded on the New York Stock Exchange.
Saab trades under the ticker symbol SAAB B on the NASDAQ OMX (Stockholm). (It does not trade in the US)
Dannon is a subsidiary of Groupe Danone of Paris. It trades in Paris under the ticker symbol BN It also trades on the Pink Sheets in the US under the ticker symbol DANOY
X on the NYSE.
U.S. Bank is a division of U.S. Bancorp. The ticker symbol for US Bancorp is USB and it is traded on the New York Stock Exchange.
The ticker symbol for Bank of America Corporation is BAC and it is traded on the New York Stock Exchange.
Fiat trades under the symbol F on the Italian Stock Market. It trades in the US under the ticker symbol FIATY on the pink sheets.