PORTLAND, Maine — The Wings of Freedom nationwide tour is in Portland this week. It’s a living history display of the Boeing B-17 Flying Fortress, the B-24J Liberator, B-25 Mitchell Bomber and the P-51 Mustang Fighter. These aircraft were the backbone bomber and fighter aircraft during World War II, and they’ve been perfectly restored. The tour arrived at the Portland Jetport Wednesday afternoon and are available for walkthrough tours until 4:30 p.m.