Cathay Pacific, one of two airlines chosen to operate flights for the 'air travel bubble,' said it has seen a “very positive response” to Monday’s announcement.

“Seats on our air travel bubble flights are selling fast, while some of the flights are sold out,” said a Cathay Pacific spokesperson.

CNA has also contacted national carrier Singapore Airlines (SIA).

One travel agency, Dynasty Travel, has already received enquiries from customers who are “already vaccinated and are keen to travel to Hong Kong once the borders are open,'' said the firm’s director of public relations and communications Alicia Seah.

“The official announcement of the resumption of the Singapore-Hong Kong Air Travel Bubble (ATB) certainly spells optimistic news for the gradual resumption of cross-border travel,” said Chan Brothers Travel senior marketing communications manager Jeremiah Wong.

“With stricter conditions and more stringent public health protocols that are going to be introduced by the two governments of Singapore and Hong Kong in relation to the ATB, it is in line with travellers' consideration, and likely to give confidence to Singaporeans, in resuming leisure travel in a vigilant manner,” Wong added.

“We are very hopeful that the bubble can resume smoothly, given Singapore and Hong Kong's efforts in contact tracing and containing the spread,” said a spokesperson for Nam Ho Travel, adding that Singapore’s vaccination programme is likely to help ease the opening of borders.

The resumption of the travel bubble will “definitely attract” corporate travellers as well as those wishing to visit friends and family, said Seah of Dynasty Travel.

Leisure travellers however are likely to consider factors such as price and availability of tickets, she added.

“For tour packages, we must ensure that theme parks and attractions be open so travellers can enjoy their holiday,” she said, noting that attractions such as Hong Kong Disneyland are currently allowing only up to 75 per cent of their usual visitor capacity, and are closed twice a week.

Dynasty’s tour packages - which include the cost of airfare, accommodation and tickets to attractions - start from S$1,388, noted Seah.

Meanwhile, Chan Brothers Travel will monitor tourism trends as well as updates regarding hygiene protocols and flight operations.

The company will also work with its partners in the development and marketing of “new enhanced Hong Kong offerings,'' Wong said.

“We will be paying particular focus on Hong Kong's great outdoors and exemplary accommodation providers amongst other elements of the whole holiday experience,” he added.

Nam Ho Travel said it is currently in the midst of planning tour packages, noting that many Hong Kong hotels are “keen to collaborate” to fill up their rooms.

“Due to the limited flights as well as overwhelming demand right now, we are tentatively selling only hotel packages without airfare,” said the company’s spokesperson.

Nam Ho noted it is hoping to proceed with packages it had planned for the initial rollout of the travel bubble, which would have cost between S$329 and S$628 without airfare.

"We are in the middle of re-negotiation for rates right now, therefore we are not sure whether the same rates will still apply," said the spokesperson.

She said hotels have given Nam Ho “special promotions”, adding that the agency is in talks with airlines regarding airfare.