HONG KONG — Hong Kong and Singapore will start an air travel bubble later this month, allowing travelers from each city to visit the other without entering quarantine.

The travelers must test negative for the coronavirus before they leave, when they arrive and before they return. The bubble starts Nov. 22 with one designated flight a day to each city carrying a maximum of 200 travelers each. It will expand to two flights Dec. 7.

The bubble will be suspended for two weeks if either Hong Kong or Singapore reports a seven-day moving average of more than five untraceable coronavirus infections, according to the Hong Kong government.

“Hong Kong and Singapore are similar in terms of epidemic control. Both are regional aviation hubs and international cities, enjoying strong trade, investment, finance, tourism and people-to-people ties,” said Hong Kong’s secretary for commerce and economic development Edward Yau. “The revival of cross-border air travel between the two places is of utmost importance.”

He said that he hopes the aviation, tourism, hotel and retail businesses will benefit from the bubble, and that it would gradually help Hong Kong’s economy to recover.