It isn't uncommon for major airlines to take a swipe at one another. We have seen several examples throughout the year. Heck, just a couple of days ago, United Airlines' CEO Scott Kirby took a shot at American Airlines , claiming that its days may be numbered.

Now, United Airlines seems to be in another feud. This time, the airline is battling Southwest Airlines over billboards in Denver.

We'll take a closer look at the billboard feud. However, all the talk on Saturday wasn't about the billboards. Instead, passengers across the U.S. faced delays and cancellations on one of the busiest travel weeks of the year .

Here's a closer look at the breakdown of the cancellations and delays, and what travelers can anticipate during the coming days.

United Airlines And Southwest Airlines Are T

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