I didn't see mention of this on the board but there was an article on mlb.com/cut4 saying that the last time the O's turned a triple play, Sep 1, 2000, was also a 6-4-3 TP that happened when the infield fly rule was not called.
"Then-O's shortstop Melvin Mora intentionally dropped a popup off the bat of Sandy Alomar, Jr., but because the infield-fly rule wasn't called he threw to second baseman Jerry Hairston Jr., who stepped on second for the forceout on Wil Cordero and tagged Travis Fryman (for the second out) before throwing to first to retire Alomar -- who hadn't run the play out. Watch for yourself:"
http://m.mlb.com/cutfour/2017/05/02/227908458/orioles-turn-seasons-first-triple-play-with-complicated-6-4-3
"Then-O's shortstop Melvin Mora intentionally dropped a popup off the bat of Sandy Alomar, Jr., but because the infield-fly rule wasn't called he threw to second baseman Jerry Hairston Jr., who stepped on second for the forceout on Wil Cordero and tagged Travis Fryman (for the second out) before throwing to first to retire Alomar -- who hadn't run the play out. Watch for yourself:"
http://m.mlb.com/cutfour/2017/05/02/227908458/orioles-turn-seasons-first-triple-play-with-complicated-6-4-3