Translation:They aren't going to travel next January.
"they are not going to travel the next January " is marked incorrect, WHY?!!
American English, in my experience as a native american, would not use the word *the * when expressing this thought. Please correct me if your experience is different.
ellas or ellos should work here. there is no way to tell which gender it refers to
Here you have two verbs. One is viajar, which means to travel. The other one is an expression van a that preceds viajar here. It's a conjugated form of ir a for third person plural (they).
Ir a means going to. As in:
Voy a leer este libro. (I'm going to read this book.)
Vamos a viajar a Francia el próximo lunes. (We're going to travel to France next Monday.)
They are not going to travel next January was marked wrong as of 10/10/19. I have reported it... "Are not" and "aren't" are the same thing.
No, there's absolutely nothing wrong with using a contraction like aren't.