[6] Module 1 | The significant milestones and key events in the historical development of the aviation and air transportation industry.

13. **Advancements in Aircraft Technology (21st Century):

The introduction of fuel-efficient aircraft like the Boeing 787 Dreamliner and Airbus A350, as well as the development of sustainable aviation fuels, has marked a shift towards more environmentally-friendly air travel.

14. **COVID-19 Pandemic (2020):

The pandemic had a severe impact on the aviation industry, causing a sharp decline in passenger numbers and financial losses. Airlines adapted by implementing safety measures, reducing routes, and accelerating digital transformations.