Check-in for air travel differs depending on your starting destination, your final destination, the airline you are flying and your travel day and time.
Boys continue growing until age 17 or 18. Boys and girls grow about two inches per year until they reach puberty. Then they each have a growth spurt that lasts a year or two. During the growth spurts, boys grow a little faster than girls. Girls reach puberty (on average) about a year before boys do. Girls also end puberty earlier than boys.
Puberty hits boys slightly later than it does girls. In general, boys begin puberty between the ages of 12 and 15 years. This means their biggest growth spurt happens about two years after it does with girls. Most boys stop gaining height by age 16, but their muscles may continue to develop.