nations military intelligence assistance. an airplane that runs on zero fuel has just flown across the pacific. it's called the solar impulse 2. it landed in the u.s. state of hawaii after making a historic trip from japan. the aircraft completed the longest and most difficult part of an attempt to fly around the world using only the power of the sun. as we have been mentioning it is a vote ahead for greece. voting begins at 7:00 a.m. sunday. the country's european creditors warn that a vote of no will jeopardize greece's membership in the eurozone. prime minister alexis tsipras says they are bluffing. right now, polls show an outcome that is too close to call. our richard quest is on the ground in athens and he gave us an update late friday night. >> reporter: it is very close. they're just about neck and neck 43-47, but that's within the margin of error, according to the latest polls, and there are 12% undecided.