Nextant installs a new interior, adds new fuel-efficient Williams FJ-44 engines, redesigned aerodynamically enhanced nacelles and transforms the flight deck with latest-generation Collins Pro-Line 21 avionics for improved safety, functionality and capability.

FORBES: Aircraft Makeover: Certifiably As Good As New

On in-flight security, we are moving faster than the international community at large to ensure UK aircraft are fitted with intrusion-resistant flight deck doors, and last month we acted to ensure that flight deck doors on foreign aircraft are kept locked, as they have been on UK aircraft since very soon after the US attacks.

BBC: Air marshal statement in full

In 2011 the captain of a Boeing 767 was unable to gain re-entry to the flight deck having taken a short break, with the plane airborne over the London area.

BBC: Plane taking off

It added the captain believed the crew had been interrupted pre-flight by someone visiting the flight deck, which had distracted them.

BBC: Essex

Four elevators bring aircraft to the flight deck and fighters are launched by British-invented steam catapults known as "fat cats".

BBC: News | In Depth | Military Fact Files

Standing on the giant flight deck, with a banner reading "Mission Accomplished" overhead on the bridge, the commander-in-chief saluted the men and women of the U.S. military.

CNN: Bush: Iraq is one victory in war on terror