Congratulations on your decision and efforts to improve your health. If you need to use a potential job as motivation to improve yourself, so be it.
All the posters have given great advice...especially the walking vs. running posts. If you go to a gym, ride a bicycle...much easier on the knees. I'd strongly encourage you to continue pursuing weight training in your quest for improvement. An extra pound of muscle will burn as much as 50 calories every day, vs. a pound of fat that takes just a few to maintain.
As pointed out before, discipline and sacrifice are needed. This is hardest in the beginning. After the first month, you won't find yourself forcing yourself to excercise. After a few months, you may even feel a little guilty when you miss an occasional workout.
It's amazing how little effort it takes with a combination of strength training, aerobics, and proper diet. Don't fall for the b.s. advertisements for "easy" weight loss products. It'll take time...probably a year or longer to drop 100 pounds safely. Keep in mind how long it took to gain that extra 100 pounds. It didn't arrive overnight, nor will it depart overnight.
I don't doubt obese people have been hired by airlines in the past. I believe obesity is often a sign of poor discipline and self-image, qualities I wouldn't look for in someone I was about to invest many thousands of dollars to train. This is just my opinion, but I believe it's shared by most in the scientific and medical professions.
Congratulations again on making the decision to improve a weakness. It's so much easier to blame someone/something else for the problem. The good news is once you start seeing improvements, it will be easier to motivate yourself. Sacrifice today will build a better tomorrow, whether you get an airline job or not.
Best wishes.
By the way, 6'2", 220 lbs., and a true 10% body fat would give you a physique similar to what many bodybuilders maintain in the off-season. A little ambitious, even if you plan on doing some serious weight training. Tables published by the insurance industry for height/weight, although they don't apply well to people who seriously weight train, would put your proper weight range from 185 to 195 lbs., as I recall.