booking a flight doesn't have to be expensive. just go to priceline. it's the best place to book a flight a few days before my trip and still save up to 40%. just tap and go... for the best savings on flights, go to priceline. >> are we alone in the universe? this is the question that has plagued man's minds forever and now the pentagon says maybe not. they acknowledged a top secret program that shows the government has been trying to answer that question for years, and the defense department released videos of an unidentified flying object and the pilot who saw this describes what he saw to cnn. >> well, the first thing is it