Upfront Plus is usually an aisle seat or window seat that comes in the first two rows. The middle seat remains empty. However, Premium seats offer additional legroom and a Preferred seat, a place closer to the front of the aircraft. Lastly, the standard seat includes those that do not come in the above three categories. So, passengers must understand the features of each seat and later go through the Frontier Airlines seat selection process. However, you may not know how to pick a seat. Therefore, use the information below for that.