TLDR; Some runway(s) closed due to construction/repair, other runways closed due to "cloud cover". Only one runway was open for departures and one for landings. Archive: https://archive.today/PYYmb From the post: >>Many travelers at Denver International Airport (DIA) encountered large runway backups on Sunday. Several travelers shared photos on social media of a lengthy wait to take off at the airport. 9NEWS viewer Edwin Favela shared a map from Flight Aware showing upwards of 70 planes waiting to depart on the tarmac at DIA. 9NEWS Weather Impact Team meteorologist Chris Bianchi said the line of planes was caused when the airport only used one runway for takeoffs on Sunday, with all departure traffic using Runway 16R.