by car, not plane. here is cbs's nancy chen. >> reporter: airports were buzzing today, but not as much as expected for a holiday weekend. >> i thought it was going to be a lot more crowded, being a long weekend, but it is not so bad. >> reporter: but the surging delta variant, and the c.d.c.'s recommendation that the unvaccinated avoid travel, has caused many to rethink their plans. covid concerns caused peter monaghan of maryland to cancel his family's vacation to disney world for the second time. it sounds like a challenging decision. >> oh, it was. we had a count-down clock and everything going, and then-- and then delta hit out of the blue. >> reporter: the airlines are feeling it, too. delta, united, and american airlines are all struggling to reach pre-pandemic passenger loads as the virus persists. >> we are seeing a big dropoff in onboard bookings, we're seeing a big increase in flight cancellations, where people are worried about the delta variant. and of being in sessn.