From hours at security to bulletproof cockpits: How 9/11 changed air travel

Not long after several planes were hijacked and used to wreak devastation on downtown New York and Washington, DC, a quarter of a century ago, air travel for millions of people all over the world changed beyond recognition – forever.

Two of the planes, hijacked by men linked to al-Qaeda, were flown into the Twin Towers at the World Trade Centre at the south end of Manhattan Island in New York Ci...