Exhibit B



                             JOINT FILING AGREEMENT

                     The undersigned hereby agree that the Statement on Schedule
         13G, dated July 14, 2005 with respect to the shares of Common Stock of
         Kitty Hawk, Inc. and any further amendments thereto executed by each
         and any of us shall be filed on behalf of each of us pursuant to and in
         accordance with the provisions of Rule 13d-1(k)(1) under the Securities
         Exchange Act of 1934, as amended.

                     This Agreement may be executed in separate counterparts,
         each of which shall be deemed an original, but all of which shall
         constitute one and the same instrument.

         Dated: November 22, 2005


                                  POTOMAC CAPITAL MANAGEMENT LLC

                                   By:   /s/ Paul J. Solit
                                        ----------------------------------
                                         Paul J. Solit, Managing Member

                                   POTOMAC CAPITAL MANAGEMENT INC.

                                   By:   /s/ Paul   J. Solit
                                        ----------------------------------
                                         Paul J. Solit, President



                                   PAUL J. SOLIT

                                    By:   /s/ Paul J. Solit
                                        ----------------------------------
                                          Paul J. Solit