1 - The president travels to Belo Horizonte tomorrow. 2 The president is going to travel to Belo Horizonte tomorrow. 3 The president is traveling to Belo Horizonte tomorrow. 4 The president will travel to Belo Horizonte tomorrow.
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I would only add that, grammatically, they are identical: in each case the verb is intransitive, meaning it would still make sense as "The president travels' "The president will travel." etc.