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.
There's a great book called What's Happening to My Body? A Book for Girls by Linda Madaras. It says that girls usually have a growth spurt at the beginning of puberty which usually lasts less than a year. By the time of her first period, the growth will slow a little to 1-2 inches per year. Girls usually reach their full adult height within 1-3 years after their first period. From the time of age 2, humans usually grow about 2 inches per year (that is on average-not necessarily steadily-it is often in spurts).