Original sentence: On November 1, 1955, United Airlines Flight 629, a Douglas DC-6B airliner, exploded over nearby Longmont while en route to Portland from Stapleton, killing all 44 persons aboard
Edited sentence: On November 1, 1955, United Airlines Flight 629, a Douglas DC-6B airliner, exploded over nearby Longmont while en route to Portland and Seattle from Stapleton, killing all 44 persons aboard