aircraft. Unlike most commercial 737s, the BBJ MAX has integrated airstairs to allow independent operations at remote airfields. BBJ MAX aircraft also come with equipped with all of the optional systems and features available on the commercial 737, as well as the highest takeoff weight and maximum engine thrust. Another key difference is the installation of auxiliary fuel tanks in the cargo compartment to achieve ranges in excess of 6,000 nmi (11,110 km), and a low cabin altitude system. The latter maintains a maximum cabin altitude of 6,500 even at the maximum cruise altitude of 41,000 ft, to improve passenger comfort and well-being. The BBJ MAX benefits from its commercial roots. Direct operating costs are estimated at $5,200 to $5,600 per hour – significantly lower than purpose-built business jets. This efficiency is partly enabled by a low utilization maintenance program (known as LUMP), which stretches out the maintenance intervals for BBJ operators – major checks occurring every 4 years, and heavy checks only once every 12 years. BBJ 737-7 (BBJ MAX 7) is a variant of Boeing 737 MAX 7. It is 6 ft 4 in (1.93m) longer than the original BBJ1 and features a range of 6,600 nmi (12,225 km), which is 445 nmi (825 km) further than the BBJ1. The 737-7 is currently undergoing certification. BBJ 737-8 (BBJ MAX 8) is a variant of the Boeing 737 MAX 8. It first flew on April 16, 2018, and was first delivered in October of that year. The middle member of the family, it offers a strong combination of size and range. BBJ 737-9 (BBJ MAX 9) is a variant of the Boeing 737 MAX 9 and is the largest member of the BBJ MAX family, offering a cabin floor area of 1,120 sq ft (104.1 m2). The first BBJ 737-9 was delivered green on August 18, 2021. In 2021, the equipped price of the BBJ MAX 7 was $98.3M, $107.3M for the MAX 8 and $115.2M for the MAX 9. Specifications Wide Body Based on Boeing's commercial 787 Dreamliner, the BBJ 787 is a successful business jet featuring a composite airframe and low cabin altitude system. It is partnered with the largest passenger and business aviation aircraft currently produced, the 777X. The BBJ 777X was announced on Dec. 10, 2018, and it will have the capability to fly more than halfway around the world without stopping, farther than any