A member of the National Guard stands watch at a security checkpoint at La Guardia Airport in New York...
A member of the National Guard stands watch at a security checkpoint at La Guardia Airport in New York November 25, 2015. Millions of Americans embarked on their Thanksgiving travels on Wednesday with security in airports, at New York City's parade festivities, and other venues expected to be heightened amid jitters after the Paris attacks last week. REUTERS/Brendan McDermid