Two Air France aircraft flying to Paris from the US were diverted because of security threats.
One was sent to Halifax in Canada, while the other flew to Salt Lake City in the US state of Utah.
Both aircraft landed safely and the passengers were unharmed, the BBC reported.
The incidents came as the Paris terrorist attacks on Friday night, which killed 129 people and wounded 400, put European countries on high alert.
The French education ministry yesterday cancelled all school trips within France by French schools until November 22.
“These cancellations don’t specifically include foreign school parties, but the French Ministry of Education has advised foreign school groups to avoid travelling to France for the time being,” the Foreign and Commonwealth Office said in an updated travel advisory.
Part of Hanover railway station was closed yesterday while a suspicious object was investigated.
An international football friendly match between Germany and Holland was cancelled shortly before kick-off last night. The stadium in Hanover was evacuated after “concrete” information about a bomb threat, according to the city’s police chief.
Roads were blocked off in an area of Saint Denis, in the same district as the Stade de France stadium where suicide attackers detonated bombs on Friday, as armed police raided a flat and gunfire was exchanged in the early hours of this morning.