Study math and science. These are the subjects that are most important in the airline engineering industry, and you'll need to do well in these subjects in order to get ahead in that field.
Attend a four year university and get a degree in mathematical sciences. This is the baseline degree for an airline engineer.
Apply for an airline engineering program. There are dozens of schools that you can choose from, so pick one based on the program and the location that suits you the best.
Get your terminal degree in airline engineering and apply for jobs in the airline engineering industry.