(06/12/1998) -- The orbiter Discovery touches down on Runway 15 of KSC's Shuttle Landing Facility to complete the STS-91 mission. Main gear touchdown was at 2:00:18 p.m. EDT on June 12, 1998, landing on orbit 155 of the mission. The wheels stopped at 2:01:22 p.m. EDT, for a total mission-elapsed time of 9 days, 19 hours, 55 minutes and 1 second. The 91st Shuttle mission was the 44th KSC landing in the history of the Space Shuttle program and the 15th consecutive landing at KSC. During the mission, the orbiter docked with the Russian space station Mir for the ninth time, concluding Phase I of the joint U.S.-Russian International Space Station Program. STS-91 also featured first flights for both the Alpha Magnetic Spectrometer and the Space Shuttle super lightweight external tank. The STS-91 flight crew included Mission Commander Charles J. Precourt; Pilot Dominic L. Gorie; and Mission Specialists Wendy B. Lawrence, Franklin R. Chang-Diaz, Janet Lynn Kavandi and Valery Victorovitch Ryumin of the Russian Space Agency. Astronaut Andrew S. W. Thomas also returned to Earth as an STS-91 crew member after 141 days in space