Fleet renewal

We have one of the most modern fleets in Central and Eastern Europe. Among the aircraft we use, the most significant are the wide-body and long-haul Boeing 787 Dreamliner and the medium-haul Boeing 737 MAX. Both are very environmentally friendly.

It uses Rolls-Royce engines with combustion chambers that feature low emissions of hydrocarbons (HC), smoke, nitrogen oxides (NOX) and carbon monoxide (CO). The 787's advanced engines have a higher two-flux ratio (around 10) compared to conventional aero engines with the ratio of around 7. The higher two-flux ratio enables quieter engine operation and significantly reduces fuel consumption.

Additionally, the design of the Boeing 787's engine nacelle results in laminar airflow over a larger portion of the engine surface compared to conventional aircraft. This results in reduced drag that ultimately leads to an increased engine efficiency.

The engines described are also significantly lighter than their predecessors, which – combined with the low weight of the entire aircraft – translates into lower fuel consumption. The B787 fleet consumed 20 - 25% less fuel than its predecessors. An additional advantage of this design is the 60% reduction in noise emissions and the ability to recycle a significant proportion of the components at the end of the engine's life.

It is 7% lighter than its predecessors and its wings are fitted with new types of winglets called split scimitar winglets, enabling an additional saving of almost 2% on fuel.

However, the engines are the key difference between the B737 MAX and the previous generation, the B737NG. The CFM56 units have been replaced by new-generation LEAP-1B engines that use 14% less fuel, thus emitting less carbon dioxide. These engines also provide a 40% noise reduction.

Other aerodynamic changes include minor modifications to the fuselage, the installation of upward and downward swept wingtips (winglets), which were available as an option in the B737NG, new engine covers and modifications to the undercarriage due to changes in the size and weight of the engines.