AT&T Corp’s share of US long-distance revenue fell to 51% in the second quarter down from 54% last year, according to the Federal Communications Commission’s quarterly long-distance market share report. Over the past 13 years AT&T’s share in the long-distance market has dropped 39%, although the growing market has meant that total revenue has risen consistently, according to the report. Over the same period, MCI Communications Corp saw its share of the long-distance market rise to 17 percent from 5 percent while Sprint Corp’s share has grown to 9 percent from 3 percent. Smaller carriers market share has grown at the fastest rate up 12 percent over the 13-year period.