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An inter-Korean air-traffic hotline still exists.
BBC: US B-2 stealth bombers in South Korea drill
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For the past 60 years, air travel has been governed by inter-governmental deals which dictate which airlines can fly where, how many seats they can offer and even, in many cases, what fares they can charge.
ECONOMIST: Now is the time to set the world's airlines free
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Should that match in Italy go ahead if European air travel resumes following the volcanic ash fallout from Iceland, Inter boss Jose Mourinho will have eagerly noted Espanyol's success in nullifying Barcelona's star-studded line-up.
CNN: STORY HIGHLIGHTS
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Since some of Pakistan's jihadist groups declared war on their country in 2007, they have attacked air-force bases, buses carrying servicemen and at least five offices of the Inter-Services Intelligence directorate, the military spy agency that spawned and nurtured many of the extremist outfits.
ECONOMIST: More extremist attacks��and establishment fantasies