A "loud bang" heard in north London was the result of a sonic boom from RAF jets, which were scrambled after an aircraft lost communications in UK airspace, officials said on Sunday.
원문출처 : https://www.cnn.com/2019/12/01/uk/sonic-boom-london-intl-scli-gbr/index.html
원문출처 : https://www.cnn.com/2019/12/01/uk/sonic-boom-london-intl-scli-gbr/index.html