Additional Options and Plane Select:
Go to the options menu and enter your name as "MrHappy". Exit to game 
select and quickly press Left,Right,Square,Circle,Triangle,Down. This code 
unlocks several of the cheats below and also lets you choose your plane.

Passwords:
Level: Easy Medium Hard 

WASHINGTON DBKHN DBKMO DBKQO

NEW YORK GBKHW GBKMX LLSQX

PARIS LLSHW LLSMX LLSQX

MOSCOW NL9HW NL9MX NL9QX

TOKYO R39JD R39NF R39RF

OAHU T59HW T59MX T59QX

LAS VEGAS Z99HY Z99MZ Z99QZ

MOTHERSHIP 3 99HG 399MH 399QH