AP - Forget red. The arrivals-line carpet leading into Barker Hangar was yellow — appropriate, given the night's honorees: Homer, Bart, Lisa, Marge and Maggie Simpson, all on hand to celebrate 20 years of "The Simpsons." Their series is the longest-running American sitcom, the longest-running American animated program, and it recently surpassed "Gunsmoke" as the longest-running American primetime scripted entertainment program.More...