Mets, Yankees, MLB to Mark 9/11 20th Anniversary with On-Uniform

Back in Black: Mets Announce Black Uniforms Returning in 2021 – SportsLogos.Net News

Yankees, Mets finally get to mark 9/11 anniversary with commemorative caps in-game

LEADING OFF: Mets host Yankees on 20th anniversary of 9/11

Yankees-Mets 9/11 ceremony to feature Joe Torre, Bobby Valentine, Mike Piazza; Giants, Jets to honor 20th anniversary of terrorist attacks

Yankees honor 9/11 heroes 20 years later

Sept. 11 Attack 20th Anniversary: Live Updates: With Bowed Heads, Americans Reflect on 9/11 and Its Aftermath - The New York Times

20th anniversary of terrorist attacks marked by NY teams

NY Yankees, Mets unite on 20th anniversary of 9/11

METS ANNOUNCE 9/11 REMEMBRANCE CEREMONY DETAILS - Back Sports Page

Mets, Yankees to wear first responder caps for 9/11 remembrance game vs. Yankees