A: Washington, District of Columbia, United States, B: San Diego, California, United States
After launching its two broadcast satellites "Rock" and "Roll", on September 25, 2001 XM Radio of Washington, D.C. initiated the first U.S. digital satellite radio service in Dallas/Ft. Worth and San Diego. (The original launch date of September 12 was pushed back after the 9/11 attacks.) Within two months service extended across the U.S.