Having examined the whole picture, Philip Hammond says, the militant group's claims of responsibility might be credible.
A militant group affiliated with Islamic State in Egypt claims responsibility.
FiveThirtyEight ranked airports and airlines based on their performance from May 2014 to April 2015.
Upon hearing unusual noises, the pilot requested an emergency landing and returned to Seattle.
The move came as Yemen's own national carrier, Yemenia, confirmed it was suspending all operations.
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The airline called the passenger's behavior "unruly," but she says JetBlue's policy is "no mean tweets."