Why do the cockpit windows open on some aircraft?

You might be surprised to see large passenger airliners with cockpit windows that open. Here's why some cockpit windows open, ...
4029tv

Delta flight makes emergency landing after pilot says passenger tried to access cockpit

Delta 257 emergency. Go ahead. Houston Houston Hobby via radar vectors maintain 6000. Turn left heading 270. 25 emergency. We had *** passenger get up and try to access the cockpit. Delta 2557, and ...
News.az

Emergency return in Japan: ATR-72 crew reports cockpit window fault

The aircraft, registered JA02JC, was operating flight JC-3745 from Kagoshima to Yakushima on April 13 with 46 people on board ...
KESQ News

Delta flight makes emergency landing after pilot says a passenger wanted to access the cockpit

Washington (CNN) — A Delta Air Lines flight from Houston to Atlanta made an emergency landing early Wednesday after a passenger tried to access the cockpit, the pilot told air traffic controllers.