Boeing 777s are grounded on the tarmac at Gimpo International Airport on Tuesday.
Korean Air Lines reported a net loss last year, as Covid-19 restricted international travel, but less than the year before.
Asiana Airlines on Wednesday cancelled the rest of its no-landing international flights scheduled for this month due to the resurgence of the Covid-19 outbreak.
Airlines continue to roll out unusual services as part of their efforts to overcome the impacts of Covid-19.
Korean Air Lines, the country’s largest carrier, will acquire cash-strapped rival Asiana Airlines with the help of the state-run Korea Development Bank (KDB).
Korean airlines are introducing special tourist flights around the country, hoping to both drum up business and find a use for planes that have been sat on the tarmac since the Covid-19 pandemic brought the aviation industry to a standstill.
Jin Air is issuing 109.2 billion won ($91.96 million) of new shares following a board vote in favor of the sale on Wednesday.
Airlines are flying more international routes as travel restrictions imposed by foreign countries on visitors are being eased. Domestic routes are also returning.
Jin Air on Tuesday announced it will resume five international routes starting next month.
After the coronavirus outbreak all but shut down international travel, some of Korea's budget airlines are beginning to reopen overseas routes, with Air Busan announcing Thursday it will end a four-month freeze on those flights in July.