Absolutely yes to the Phantom Eagle! I can put him on a shelf next to the old DC Direct Enemy Ace. Two WWI fighter pilots side by side.
Any Marvel character whose adventures took place in the dim and distant past is fine with me. The 6th century Black Knight (Sir Percy of Scandia and the ancestor of modern day Black Knight Dane Whitman), The 1950's Avengers and any of the Western heroes like Two-Gun Kid would be welcome.