article_snippet: Ryanair pilots had to wear oxygen masks as Ryanair pilots made an emergency landing in Barcelona on Thursday after a fire extinguisher went off in the cockpit.
article_snippet: Passengers said the pilot and first officer were unable to breathe without the masks as halon - a liquefied, compressed gas - filled the confined space as the plane flew from London Stansted Airport to Valencia.
article_snippet: Hannah White said that passengers suspected there was a serious problem, but passengers did not know the reason for the emergency landing until passengers arrived at Barcelona-El Prat Airport.
article_snippet: Fire trucks greeted the Boeing 737 when the Boeing 737 touched down shortly after 10:15am local time as passengers began to grasp the nature of the emergency.