F-14 Tomcat - Platform: Gameboy Advance

Level Passwords:
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Enter these passwords to unlock the corresponding level 
at Novice difficulty. 

Level 2: DHGJ KLFF 
Level 3: GSDF BFPT 
Level 4: RRHC FDVM 
Level 5: BPSX FDNF 
Level 6: LDFS DTKQ 
Level 7: PXSB SZNJ 
Level 8: DKXZ GZQK 
Level 9: GKQB GHCT 
Level 10: DTRH RPFJ 
Level 11: WZPK JYZX 
Level 12: JDZFLKFV 
Level 13: SPNG DRRG 
Level 14: SFGF JHDH 
Level 15: LPFH PRFZ 
Level 16: TDKZ XSHX 
Level 17: DGBV KMNB 
Level 18: KJHG RJCB 
Level 19: VBMQ RWTP 
Level 20: LKFD SPBV 
Level 21: NHDC DKPM 

Flying Cars:
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It is possible to replace the jets with flying classic cars. Something 
can be done in novice mode at level 6 that will result in a constant 
tone until you get to level 7. Level 7 will then start with classic 
cars flying at you instead of jets. The level passwords with the cars 
are identical to those with jets. You must duplicate some sort of game 
condition (complete all the first six levels with no damage? Complete 
level 6 with no damage and using only one plane?) to unlock the cars. 

UFO's, not jets:
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When you get to the main screen, go to enter password. Enter level 21's 
password and if you hear a jet sound it worked. After that you can either 
start a new game or enter a password for missions 2-20. At the top, 
instead of migs it will say ufos: and then the number. When you start 
the mission, you will be battling ufos.