You can identify your fare type by checking your confirmation email or the United mobile app, where it will be explicitly labeled under the "Fare Class" or "Segment" details. The most obvious sign of a Basic Economy ticket is the strict baggage restriction: on domestic flights, you are not allowed a full-sized carry-on bag for the overhead bin (only a small personal item that fits under the seat). If you try to bring a carry-on to the gate, you will be charged the standard bag fee plus a $65 gate handling fee. Other indicators include being assigned to Boarding Group 6 (the last group) and the inability to select a seat for free. If your ticket says "Economy (L, K, G, etc.)" and allows a carry-on, you have a standard ticket. If you are still unsure, look at the "Ticket Rules" section; Basic Economy tickets are typically non-changeable and non-refundable after the first 24 hours.