A Hole in Time — Clark Graham

Major Robert Dalton swallowed involuntarily. After his crash, he vowed he would never fly again. Not only was he forced to fly again, now he would be flying into the past. It was a new plane was designed to travel through time.The mission was going to fail. He knew that. It was more than a premonition. His assignment: Kill Hitler. Stop the Holocaust before it starts. No one could foresee the consequences of changing the time-line. Would he destroy everything and everyone in the process?