After having second thoughts , the owners traded their cities back to each other before the start of the 1941 season -- .
The Steelers franchise moved to Philadelphia and became the Philadelphia Eagles and the Eagles franchise moved to Pittsburgh and became the Pittsburgh Steelers .
After having second thoughts , the owners traded their cities back to each other before the start of the 1941 season -- so that the Steelers franchise moved to Philadelphia and became the Philadelphia Eagles and the Eagles franchise moved to Pittsburgh and became the Pittsburgh Steelers .