United often issues travel waivers when it expects to cancel or delay many flights. These travel waivers generally let United passengers change or cancel their flights for free, reducing congestion at the gate or the ticket counter. Specifics vary based on the given situation, so make sure to read up on the specifics of your travel waiver if you find yourself eligible to take advantag... https://community.tableau.com/s/idea/0878b000000ExegAAC/detail