 They're not sheltering Ukrainian military assets. They're not sheltering members of the Ukrainian military. These are civilian infrastructure, pure and simple. Kyiv City officials have declared today an official day of mourning. As Americans headed home from July 4th festivities, the summer travel boom reached a new record high Sunday. The TSA says for the first time, more than 3 million people pass through its airport security checkpoints in a single day. Experts say cheaper airfares and a stronger U.S. dollar are motivating Americans to fly.