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.
normal cephalocaudal/proximodistal pattern are reversed so hands and feet are 1st body part to grow to full size, followed by arms and legs, trunk is slowest to grow; joint development (especially wrist bones for fine motor skill - develop fully in girls 1st); girls have more coordination than boys of same age; girls attain most of height by 16 ...