Snarfed from the net (relayed to you courtesy of info@timefold.com).
The authors are cited where known.


                                |
                               _|_
                              /(_)\                       
                      -------:==^==:-------      
                           [[|  o  |]]             
  -----------------__________\_____/__________-----------------
                          _  /     \  _
                         T T/_______\T T
                         | |         | |
                         """         """
FlyBaby (from somebodies .sig)

                                |
  ______________________________|_______________________________
                          \   /(_)\   /                         
                      -----\-:==^==:-/-----      
                           [[|  o  |]]             
                             \_____/                             
                             /     \   
                           |/       \|  
                           |         |    
                                        
Cessna 172
                                |
                                |
                           ___-/_\-___
                _____________/( . )\_____________
               *    |    |  (  \_/  )  |    |    *
                   *|*  *|*  \_-+-_/  *|*  *|*
Harrier


                             \     /
                              \ _ /
                           ----/_\----
               x--------------( . )--------------x
                    x|x   | |_|\_/|_| |   x|x     
                     x    x           x    x    

CF-18 Hornet
                                |   
                                _  
                           ----/_\----
               x--------------( . )--------------x
                               ---                
                              (___)             


F16 Falcon
                             \       /
                              \ ___ /
                           ----/___\----
               x--------------(  .  )--------------x
                  x|x   |   |  \___/  |   |   x|x     
                   x    x   |___| |___|   x    x    


F15 Eagle

                              .


B2 Stealth


                                   |
               ____________________|____________________
                              \  |   |  /
                               `.#####.'
                                /`#_#'\
                              O'   O   `O

Cessna 150 (by Wolf-Dietrich Webe (lupus@sambal.stanford.edu)


                                 __!__
                             _____(_)_____
                                !  !  !

(Ceci n'est pas une) Piper (by Per Lindberg per@front.se)


                             \     /
                              \ _ /
                           ----/_\----
               x--------------( . )--------------x
                    x|x   | |_|\_/|_| |   x|x     
                     x    x           x    x    



                             _  
                            | \
                           _|  \______________________________________
                          - ______        ________________          \_`,
                        -(_______            -=    -=        USAF       )
                                 `--------=============----------------`

B52 BUFF (contributed by Mary Shafer shafer@skipper.dfrf.nasa.gov, from
          a signature by rutgers!faatcrl!jimb)



                                  \       /
                                   \  _  /
                                    \/_\/
               ()------------------(|_*_|)------------------()


Fouga Magister (by Geoff Miller, geoffm@purplehaze.EBay.sun.com)

                                _______  
                                   |     
       /--------------------------(_)--------------------------\

Glasfl:ugel Kestrel 15  'X8' Sailplane (by George Najarian najay@psitech.com)


                                //-n-\\                 
                        _____---=======---_____         
                    ====____\   /.. ..\   /____====
                  //         ---\__O__/---         \\
                  \_\                             /_/
Klingon?  (from somebodies .sig, contributed by Jim Lawson Lawson@ssdvax.mdcbbs.com)

         -------------------====+====-------------------
                             {_| |_}
                           /| _|_|_ |\
                          ( |/_____\| )
                       |--`/_/  |  \_\'--|
                   ____   //( ) |    \\   ____
                  | ++ |==|\___/ \___/|==| ++ |
                   \__/   |  ___ ___  |   \__/
                         __\/oo X []\/__
                        || [\__/_\__/] ||
                       ~~~~           ~~~~

               ______  _____    ___  ___  _________
                | |__)  | |     | |  | |   | |___
                | |__)  | |_-|  | ```' |   | |_____
               ~~~~~~~ ~~~~~~~   ~~~~~~   ~~~~~~~~~
_________ _____ _____ ___  ___ ____  ___ _______  _________ _______
|_/| |\_|  | |___| |  | |  | |  ||\.. ||  | | \ \  | |___    | |__ )
   | |     | |---| |  | ```' |  || `'\||  | |_/ /  | |_____  | |``|\_
  ~~~~~   ~~~~  ~~~~~  ~~~~~~  ~~~~  ~~~ ~~~~~~~  ~~~~~~~~~ ~~~~  ~~~~
Blue Thunder (contributed by Ralphe Neill edp328j@monu6.cc.monash.edu.au)