What you actually compare

Economy is the largest cabin and contains four or more sub-fares (basic, standard, plus, flex). Basic strips out seat selection, carry-on overhead, and same-day changes; flex adds them back. The seat itself is usually identical across the four — what changes is the rules around it.

Premium economy sits between standard economy and business. It is a separate cabin with extra legroom, a wider seat, free alcohol, and a dedicated meal service. On long-haul transatlantic and transpacific routes the upcharge over standard economy is typically 80-150%, which buys you noticeably better sleep.

Business and first are the front cabins. On most US transcontinental routes you will see lie-flat seats; on shorter regional routes you will see recliners. The cabin is sold separately and often as a fare-class bundle (e.g. flexible business with no change fees).

When an operator loads a route into its reservation system, it splits each cabin into a stack of fare buckets identified by single letters (RBDs). Y is full-flex economy; B/M/H/K/L step down in price and flexibility; T/S/X are deeply restricted sale fares. Premium economy lives in W/P. Business is most commonly J/C/D/I.

Two passengers seated next to each other can be in different buckets, paying different prices, earning different mileage. Revenue management rotates buckets in and out throughout the booking window. A $312 fare on Tuesday is gone by Friday: the bucket sold out, and the next cheapest letter is now active.

What this means at the partner OTA: the price you see on Airway Cubes is a snapshot of which bucket was open at the moment we surfaced the fare. By the time you click through to the partner site, that bucket may be closed. Always confirm the final price on the partner page.

Pattern A — basic-economy bundles on most network carriers exclude carry-on overhead. You get one personal item under the seat; carry-on overhead requires a paid upgrade or gate-checking. Always check whether your fare bundle includes overhead before showing up at the gate.

Pattern B — main-cabin bundles include free carry-on plus paid first-checked ($35-$45) and paid second-checked ($45-$55) bags. Pre-paying online during booking saves $5-$15 versus airport-side payment.

Pattern C — single-cabin point-to-point operators include two free checked bags, but you book through their own site rather than via partner OTAs. Ultra-low-cost operators are the opposite: every bag (carry-on included) is paid.

Bag pricing on the partner OTA is the ground truth. Carrier policy changes ahead of carrier websites, and partner OTAs ahead of carrier policy. Always re-check on the partner before completing the reservation.

Basic economy is universally excluded. A basic-economy fare on any US network carrier remains non-changeable and non-refundable. The only exception is the 24-hour US Department of Transportation rule, which guarantees a full refund within 24 hours of purchase on any ticket booked at least seven days before departure.

International tickets are often excluded on the same operator that offers free changes domestically. Most US network carriers allow free changes on most main-cabin international itineraries to and from the US, but European carriers retain change fees of $75-$150 per change.

Ultra-low-cost operators retain change fees structured as 'modification charges' of $69-$99 depending on how close to departure the change is made. Booking an ultra-low-cost ticket and assuming you can change it later remains a common and expensive mistake.

Network carriers run hub-and-spoke route maps with multiple cabins, paid baggage, and large global alliances. They serve the broadest range of destinations and the most stable on-time performance.

Point-to-point operators fly direct between secondary cities with a single cabin and free baggage. Schedule reliability is reasonable; premium product is absent.

Pacific-coast and regional operators specialize in west-coast or northeast-only route networks. They feed connecting traffic to network carriers under partnership agreements.

Ultra-low-cost carriers (ULCCs) sell the lowest base fare and unbundle every other product. The all-in price after baggage and seat selection often beats network economy; sometimes it does not.

Hybrid leisure operators run scheduled-and-charter mixes to leisure markets, with a single cabin or a small premium block. Frequency is low; price is competitive on the routes they run.

Inter-island and regional-jet operators serve short hops that no mainline carrier wants. They usually fly under a network-carrier banner and follow that banner's bundle rules.

Use the catalog to scope the route — origin, destination, season, typical price range, alternative airports nearby. The catalog is fast at this and honest about it.

Use the partner OTA to compare current fares on the day you want to fly. Multiple operators, multiple bundle tiers, real-time bucket availability — that is what the partner does and we do not.

Use the operator's own site for itinerary management, mileage credit verification, and customer service. Once you have booked, the operator (not the partner OTA) is your point of contact for changes, cancellations, and at-airport service.