Starting 5 August, Korean Air will resume flights to Guam, which is strong now welcoming inoculated travellers on quarantine-free trips.
Guam joins other US territories such as Saipan — also on South Korea's potential bubble list — which currently accept travellers who can show proof of Pfizer, Moderna, Janssen and AstraZeneca shots.
The once weekly schedules will fly from Incheon to the US island, and flight frequencies will be adjusted based on the vaccination progress and travel demand.
Other Korean airlines, including Asiana Airlines, Jeju Air, T'way Air and Air Seoul, are said to be resuming flights to Guam.
Already, agencies are seeing a boom in overseas vacation packages as bubble talks with other countries are swiftly driving up local interest.
As of Monday, 28 June, some 30% (more than 15 million people) of South Korea's 51.3 million population have received their first vaccination shot, according to the Korea Disease Control and Prevention Agency.