the nation's 40th president. ronald reagan would have been 100 years old today and our chief national correspondent john king is there. john? >> this is the air force one presidential library in simi valley, california. that boeing 747 carried ronald rag about around the united states and around the world as well. this would have been the 100th birthday of the 40th president of the united states and so on this reagan centennial, nancy reagan participating in a wreath laying ceremony for her husband who she so fiercely protected not only in his governing days but also in his post presidency days. many on hand, reagan family friends as well. a flyover by four teams from the uss reagan off the coast for today's celebrations. the key note speech delivered by an old reagan hand. jim baker was his chief of staff.