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>> reporter: delta, united, and american have seen a more manageable 2% to 5% of flights canceled sunday but it doesn't soften the blow for many. >> kind of difficult. there's been delays in the lines as well as the flights. pretty much regular christmas flying. >> reporter: how worried are you about traveling with covid spreading like a wildfire? >> it is a concern. >> reporter: as airports are packed so are testing lines. the demand in over drive for those seeing loved ones. >> we've obviously got to do better. i think things will improve greatly as we get into january but that doesn't help ...

Stage of the pandemic. but it's not alone. new jersey, florida, delaware, and massachusetts also recently reported new daily records, this as the national average of new infections approaches an all-time high set almost one year ago. meanwhile, some medical experts are questioning the c.d.c.'s new isolation guidelines. long covid testing lines remain throughout the country, with wait times topping four hours in parts of florida. the recent surge in cases hasesn 1,000 domestic flights today, adding to the misery of air travelers still trying to return home from the holidays. and the c.d.c. has ...

President, no legislative business of the day, but ceremonies planned by house speaker pelosi. let's begin this hour with the coronavirus. joining me now nbc's stephanie gosk in new york, nbc's megan fitzgerald in chicago, and dr. michael osterholm at the university of minnesota. welcome all. happy new year. stephanie, two big concerns across the country. the safety of children head back to school, the demand for testing. you highlighted both this morning. those massive testing lines in massachusetts, for instance. >> reporter: yeah, unbelievable picture if you saw that, just hundreds of cars ...

Minor. >> john: and we should point out the governor-elect will be our guest on sunday, i'll be hosting, he prepares to take the reins in the commonwealth of virginia. >> sandra: and new at 2:00, president biden says he will purchase up to a billion covid tests but remains to be seen when americans will actually be able to receive them. so does this even move the needle on shortening the long testing lines? and, senator lindsey graham firing a warning shot at mitch mcconnell saying he will not back mcconnell as leader unless he proves he can work with former president trump. we will speak to t...

When they are maximally infectious. >> reporter: the cdc arguing 80 to 95% of transmission occurs in the first five days. still the guidance is drawing fierce debate among experts. >> there is absolutely no data that i am aware about with the omicron -- that supports people coming out of isolation five days after they were first diagnosed with the virus. >> you either shutdown the society, which no one wants to do, or you try and get a situation where you can safely get people back, particularly to critical jobs, without having them be out for a full ten days. >> reporter: long testing lines a...