“Transport Bubbles” or “Air Travel Arrangements” are temporary arrangements between two countries aimed at restarting commercial passenger services when regular international flights are suspended as a result of the COVID-19 pandemic
The term "air bubbles" refers to bilateral agreements that India has reached or is working on with specific countries to allow their national carriers to ferry passengers back and forth from India. Since the COVID-19 pandemic hit the country, flying to India has become associated with having air bubble flights. https://www.indianeagle.com/air-bubble-flights/