Estrella Communications has completed its previously reported, $30-million acquisition of Los Angeles subscription UHF television station KBSC-TV Channel 52 from Oak Media Corp. . . . General Dynamics reported that it has extended its $30 cash tender offer for all shares of common stock of Cessna Aircraft until Oct. 18 . . . Pan Am announced an unrestricted, $99 one-way fare for midweek flights between New York and Florida . . . The American Iron and Steel Institute reported that steel production was 1.636 million tons in the week ended Oct. 12, up 0.7% from the week before.