#US: Noon: Markets trading mixed; Airline, Travel shares↓. US might ban Tiktok &amp; other Chinese apps as per Secretary of State. Novavax's stock surged 30% after getting funding of $1.6 bn for Covid vaccine from Fed Govt. #DJIA -0.64% #NASDAQ +0.46% #SP500 -0.09%. Dollar index↑. https://t.co/Rs1tjiex61