The 747-100 had its first flight on February 9, 1969, and entered commercial service in 1970. Boeing delivered 250 of the 747-100s, the last in 1986. Boeing built two versions of the 747-100 passenger airplane, one of which had a higher payload capacity and was known as the -100B. The 747-100 was also available as a short-range (SR) airplane, with a modified body structure to accommodate a greater number of takeoffs and landings. The 747SR model typically was used by airlines on short flights with a high-passenger capacity, as many as 550.