In February 2002, the airline launched its first regional product, Frontier JetExpress, initially operated by Mesa Airlines using CRJ-200 regional jets. Similar to "express" operations of other carriers, Frontier JetExpress was targeted for markets to and from Denver that do not generate traffic sufficient to support Frontier's smallest mainline jet, the Airbus A318, but could still offer lucrative business with a smaller jet.
Say for example there are two hotels side by side. One meets all the requirements of the Diamond classification, pool, valet etc etc. The other may have vastly better quality rooms, best furnishings, best of everything but does not have a pool. If that was your hotel, even though anyone can clearly see that it's better than the hotel next door, would you feel it's fair it won't meet the Two Diamond standards?