I'm foreigner, traveling from EU to US

Hi,

I'm EU citizen, travelling to US with my family and need to use my phone from T=0. We are 5 people. 3 kids, me and my wife. We're flying to Boston. What is the best way for all of us to get the functional SIM which we can use for calling with a reasonable data limit (unlimited would ve the best).

Is there a T-Mobile somewhere on airport? Or can we buy the SIM cards remotely (possibly the eSIMs?). We're staying for 3 weeks.

Thanks for your recommendations.