On February 18, we arrived at Aspen Airport to find that all flights had been cancelled due to the failure of a navigational aid. We were due to fly to Atlanta with Delta Air Lines to connect with a Virgin Atlantic flight back to London the next day.
Unhelpful Delta agents simply told us to come back tomorrow. We explained we had 24 hours to reach Atlanta to check in for our flight to the UK and asked to be re-routed. (We did not have a through-ticket, so we would have had to pay Virgin again if we had missed that flight.) The agent said all she could do was to give us a letter for our insurers and left us to find our own solution.
As we could not drive to Denver (the I-70 was closed due to a landslide), a friend drove us to Grand Junction airport, and we managed to fly to Atlanta via Salt Lake City and Las Vegas, arriving at 5am on February 19.