I'm not seeing this as very low cost. The European airlines like TUI regularly do for example London to Punta Cana for about $480 return and that involves a 9 hour flight each way on a Dreamliner with meals and a 23kg checked bag provided. Arajet is charging $470 for a a shorter return flight with no bag and no meals and a far inferior plane and seat.
Hijo you gave me a shocked emoji. I hope you're not baulking at the thought of spending $480 on an air fare, I had you down as a high-roller who would rub shoulders with me in business class. Don't tell me you're a penny pinching Spirit Airlines type of dude.