Boeing 707
The 707 has been used for many different types of flights. Versions of the 707 used by militaries are the E-3 Sentry, KC-135 Stratotanker, and the C-137 Stratoliner. Boeing made 1,011 707s (including the 720). More than 800 military planes were made. In August 2011, 10 707s were being used by airlines.