This trainer has been made for Who's That Flying
It should support most game versions, tested with v1.0.

Trainer download link:
Who's That Flying +2 trainer

First run the trainer.
Then run the game. (You can start the game with it's own icon or You can use the Start game button in the trainer.)
Hit number keys on the numerical keyboard to turn options on/off. Make sure that NumLock is active.
You can also use the checkboxes to enable/disable the options.

There are 2 options in this trainer:

1. Unlimited City Lives
2. Rapid fire

NOTES:

Unlimited City Lives: The health of Your city will be always on maximum.

Rapid fire: Some serious firepower, worthy to the mighty Earth Guardian.

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Some information about virus reports for trainers generally. Read it before You post something about some virus.
http://szemelyesintegracio.hu/cheats/41-game-hacking-articles/212-trainers-and-anti-vir-softwares