The timeline for air travel demand to return to pre-coronavirus levels is uncertain and can vary depending on several factors. It is important to note that I, as an AI, do not have access to real-time data or future projections. However, I can provide some insights based on the general trends and considerations.

The recovery of air travel demand depends on various factors, including the global control of the COVID-19 pandemic, vaccination rates, government travel restrictions, economic recovery, and passenger confidence. Here are a few points to consider:

1. Pandemic Control: The effective control of the COVID-19 pandemic, including widespread vaccination, reduced infection rates, and the lifting of travel restrictions, is crucial for the recovery of air travel demand. The progress of vaccination campaigns and the containment of new variants will play a significant role in restoring passenger confidence and facilitating the resumption of travel.
2. Travel Restrictions: The relaxation or lifting of travel restrictions imposed by governments is an essential factor in reviving air travel demand. As countries gradually ease restrictions, including quarantine requirements, testing protocols, and border closures, it is expected that more people will feel comfortable traveling again.
3. Economic Factors: The recovery of the global economy is closely tied to the recovery of air travel demand. Factors such as job growth, consumer spending, business travel, and tourism play a significant role in determining the pace of recovery. Economic stability and increased consumer confidence will likely contribute to the resurgence of air travel demand.
4. Passenger Confidence: Rebuilding passenger confidence is crucial for the recovery of air travel demand. The implementation of health and safety measures by airlines and airports, such as enhanced cleaning protocols, improved ventilation systems, and the enforcement of mask-wearing policies, can help reassure travelers and encourage them to return to the skies.

It’s challenging to provide a specific timeline for the return to pre-coronavirus levels of air travel demand, as it depends on the interplay of these factors and their regional variations. Some industry experts and organizations have offered projections ranging from a few years to several years for a full recovery. It is expected that air travel demand will gradually increase as the global situation improves, but the exact timeline will depend on the progress made in controlling the pandemic and restoring passenger confidence.