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 cards 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.

2	DHGJ KLFF	XDFT RLFF
3	GSDF BFPT	KJTR DBPT
4	RRHC FDVM	RVBP ZJVM
5	BPSX FDNF	BMNQ YLNF
6	LDFS DTKQ	LFMS DNBQ
7	PXSB SZNJ	PGHP CZNJ
8	DKXZ GZQK	DKDG BPQK
9	GKQB GHCT	GSYP ZLCT
10	DTRH RPFJ	DCZX RPQR
11	WZPK JYZX	WRTN JYSX
12	JDZFLKFV	JDPQ MLRT
13	SPNG DRRG	SPBX BMRG
14	SFGF JHDH	SPXP RGDH
15	LPFH PRFZ	LPFG NBGZ
16	TDKZ XSHX	TQWJ GZHN
17	DGBV KMNB	BGJK SZPQ
18	KJHG RJCB	PLMN HRTY
19	VBMQ RWTP	GLMR TRRC
20	LKFD SPBV	NHDJ PBCX
21	NHDC DKPM	LCML FLTC

Note: There are 20 basic levels in the game. Level 21 is a repeat of level 1, but with UFOs instead of jets to shoot down. The password at level 22 is the same as level 2. You must enter the password for level 20 or 21 and play the game from there to get UFOs instead of MIGs. Entering level 21 in Ace mode gets you started all over again from level 1, but with World War I era tri-planes instead of jets or UFOs.

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