In my experience, the most common of all warbirds is the Harvard and T-6 Texan. There were two T-6 Texans at the Olympic Flight Museum as well as one Harvard. Additionally there was an A6M2 "Zero" replica built from an original Harvard airframe.

T-6 Texans
AT-6D Texan 90599 N86116 AT-6D Texan 90599 N86116 AT-6D Texan 90599 N86116 AT-6D Texan 90599 N86116
AT-6D Texan 90599 N86116 AT-6D Texan 90599 N86116 AT-6F Texan 44-81753 N2834D AT-6F Texan 44-81753 N2384D

Harvard Mk.IV
Harvard Mk.IV 52-8608 C-FWBS Harvard Mk.IV 52-8608 C-FWBS Harvard Mk.IV 52-8608 C-FWBS Harvard Mk.IV 52-8608 C-FWBS
Harvard Mk.IV 52-8608 C-FWBS Harvard Mk.IV 52-8608 C-FWBS Harvard Mk.IV 52-8608 C-FWBS Harvard Mk.IV 52-8608 C-FWBS

A6M2 "Zero" replica built from a Harvard Mk.IV
Harvard Mk.IV N15796

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