The aircraft used in the attack was a Boeing 767-222. The aircraft had a registration of N612UA, and it was built in 1983 by Boeing. The airplane could seat 168 passengers in total (10 seats in first class, 33 seats in business class, and 125 seats in economy class). On this particular flight, 56 passengers (5 of which were hijackers), and nine staff members. All together, United Airlines Flight 175 carried 65 people on the morning of September 11.