Hundreds of flights were canceled and thousands were delayed as a nor'easter brought flooding, power cuts and travel disruption to cities like New York, Boston and Philadelphia. Powerful winds and towering waves are battering the US Northeast, causing flight chaos and blackouts. Key points and original sources are listed below.

• Hundreds of flights were canceled and thousands were delayed as a nor'easter brought flooding, power cuts and travel disruption to cities like New York, Boston and Philadelphia.S1

• Powerful winds and towering waves are battering the US Northeast, causing flight chaos and blackouts.S2