Prime Minister Yousuf Raza Gilani has departed from London to Washington and was late for one hour. Heathrow Airport sources said they were not prior informed about the arrival of PM at the airport. During his visit, the Prime Minister is likely to hold meetings with President Bush, Vice-President Dick Cheney, US Secretary of State Condoleezza Rice, Defence Minister Gates, Democratic presidential contender Obama, Republican presidential candidate John McCain and various Pakistan communities. The meetings would discuss important regional and international affairs including Pakistan's role on war on terror.