Ameerican Airlines
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The ticker symbol for JetBlue Airways is JBLU and it is traded on the Nasdaq.
AirTran Airways was founded as ValuJet Airlines in 1992, and has been AirTran Airways since 1997. The ticket symbol for AirTran Airways is AAI.
International Consolidated Airlines Group SA
AAQS Pet Airways parent corporation was originally named American Antiquities, Inc.
The ticker symbol for US Steel is X and it is traded on the New York Stock Exchange.
Midwest Airlines is owned by Republic Airways Holdings. Republic Airways Holdings trades on the NASDAQ under the ticker symbol RJET.Note: They also own Chautauqua Airlines, Republic Airlines, Shuttle America, Frontier Airlines, and Lynx Aviation
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)