The dollar index was up 0.21% to 90.815 at mid-morning in New York, while the euro was off 0.36% to $1.209. Against the Swiss franc the dollar was up 0.45%.
The dollar may be more resilient in the near-term because "both growth and vaccination favour the U.S."
Japan's second-largest carrier said it projected a net loss of 300 billion yen for the year ending March 2021, up from its previous forecast of 240-270 billion yen.
Traders said the yuan and the dollar index remained range-bound for the time being, but the dollar could strengthen as the implementation of US stimulus boosts activity in the world's largest economy.
The Thomson Reuters/HKEX Global CNH index, which tracks the offshore yuan against a basket of currencies on a daily basis, stood at 95.96, firmer than the previous day's 95.86.
8 US gross domestic product data is due later on Thursday to gauge the strength of the world's largest economy as it struggles with the coronavirus pandemic.
Bio-tech firm JCR Pharmaceuticals rallied 5.9 percent to 2,904 yen after a report said it will produce undiluted Covid-19 vaccine developed by the British drug group AstraZeneca and Oxford University.
Separately, traders were awaiting comments later from US Federal Reserve Chair Jerome Powell, who is likely to renew a commitment to ultra-easy policy. His remarks could affect the dollar and other currencies.
Among major shares in Tokyo, Panasonic was up 2.91 percent at 1,468 yen, industrial robot firm Fanuc was up 2.74 percent at 27,895 yen, and Olympus was up 0.95 percent at 2,018.5 yen.
