Singapore Airlines added nine weekly flights to India last year, bringing its total to 104. Air France-KLM is increasing its seat capacity on Indian flights by 25 percent this winter. United Airlines has just begun offering nonstop seasonal daily flights from San Francisco to Delhi. And Delta Air Lines began nonstop service between Kennedy International Airport in New York and Mumbai in December.

In the last few years, more than 20 of the 80 international airlines that fly to India have added service, in some cases through arrangements with other airlines, called code sharing. Travel between the United States and India increased 10.3 percent from the first half of 2018 to the first half of 2019, American Express Global Business Travel reported.

At this pace, India is expected to become the third-largest aviation market by 2024, behind China and the United States, according to the Center for Aviation, a company that provides market intelligence to the aviation and travel industry.

The uptick in flights, experts say, is the result of a variety of economic, social, immigration and travel trends. More international social media and tech companies are setting up shop in India or increasing their staff. A growing number of Indians are living and working in the United States, Canada, Britain and elsewhere, and that means more homeland visits for traditionally close-knit Indian families.