Experts believe that the target of the Flight 93 hijackers was likely the US Capitol Building or the White House. The 40 passengers and crew members attempted to seize control from hijackers and eventually forced down the plane, which crashed only 20 minutes flying-time from Washington, D.C.

"If I had the opportunity to say anything to him, given what this is, I would love to tell him how much, how proud I was of him," Dale said.

His elder brother Louis Joseph Nacke II, a toy company executive, had just turned 42 two days before the 9/11 attacks. Dale said his brother liked to be called "Joey" by family members, while he preferred the name "Lou" with colleagues and friends.

"He had a Superman tattoo. He was afraid of nobody. He was my big brother. He was always my protector. And he was, he was a little brash. He was a little loud, but he was very loyal, very loving. As my big brother, I always looked up to him," Dale said, bursting into laughter when describing what kind of person his brother was.