New measures include flood-resistant doors, removable barriers for doors, and "air bricks" to allow ventilation and non-return valves on domestic and foul drains.

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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.

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It has bullet-resistant panels in the doors and dash and has push bumpers incorporated into the aluminum frame.

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