That is a lot of effort and nice analysis, but concluding the story based on the WiFi data usage is a weak support because 1. Flights get often delayed most, during the long weekend days 2. Because it is a holiday season, people like me assume the security clearance line gets busier than the regular days and reach the airport 90 minutes earlier (45 minutes earlier on a non-holiday trip) 3. November it is, places might have covered with snow or fog (SFO might be an exemption)

I think it would have been a great support to your analysis if the peak is measured on passenger count or unique devices connected to the wifi.