Get a Cessna 172 with flames! j/k
I'll assume this is your first tattoo, correct me if I'm wrong.
I think aviation tattoos are awsome if done correctly. Just like any other tattoo, don't go out and get one just for the heck of it cause more than likely you'll end up regretting it. Take your time, come up with several ideas, take your time, make sure its meaningful, take your time, research photos and paintings, take your time, visit several shops that have good references, take your time, take so more time and if you think you've waited long enough (at least a year) and your still satisfied with the idea, go for it! Not sure if you noticed but I highly emphasize on taking your time. There is really no excuse to rush and get a tattoo, unless of course your drunk, its spring break, and you think you've found the woman of your dreams

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As for the location, try to stay away from the forearms and neck area unless you have a record deal and looking proffesional is not part of the act. Some may say that its not automatic disqualification but when you go to an interview were you'll be judged, unfortunately they judge everything including tattoos and body piercings. At the end of the day its there decision wether or not you get hired. Personally I would love to get my right forearm done but I really don't see that happening hear since I live in sunny Florida where short sleeve is almost mandatory.
One last note, crosses, dragons, and clowns are very common. If you want a basic cross thats fine, but if you want it to stand out, try to find one that you like and think of a unique addition such as a different outline or a nice background. The background could consist of something memorable such as a death of a loved one, a life changing experience, or even a great accomplishment that you feel could not be done without god. Those are just some broad ideas so take your time and research as much as possible. Once that needle penetrates theres no turing back.
P.S.
The pain is highly overrated! At first it feels kinda nice but after a while it just feels annoying.