In modern airline terminology, Coach is the general name for the entire "Economy" cabin, whereas Basic Economy is a specific, highly restrictive "fare type" within that cabin. Think of Coach as the neighborhood and Basic Economy as the smallest, most restricted house in that neighborhood. When you fly "Coach," you are in the main cabin, but if your ticket is "Basic Economy," you usually forfeit the right to pick your seat, you are the last to board, you may not be allowed a full-sized carry-on bag (on airlines like United or JetBlue), and your ticket is typically non-refundable and non-changeable. The physical seat and legroom are identical to a standard "Main Cabin" or "Economy" passenger sitting next to you; the difference is entirely in the benefits and flexibility you have purchased. Because "Coach" is an older, broader term, it is often used interchangeably with "Economy," but you must check the specific "fare class" to see if you have been downgraded to the restrictions of Basic Economy.