Premiere Radio Networks announces that its syndicated “On Air with Ryan Seacrest” show is adding a fourth hour, starting May 4. The show is already heard on 130 stations nationwide. This news coincides with Clear Channel’s announcement yesterday that it is offering “Premium Choice programming elements” which include shows like Seacrest’s. “On Air” is available to stations to air between 10am and 7pm. This show is separate from Seacrest’s morning show for Clear Channel-owned KIIS (102.7) “Kiss FM” Los Angeles. Discuss it here: