Travellers wait beside a departures screen showing cancelled and delayed departures at the Southwest teminal at Los Angeles International Airport on July 21, 2016. A Southwest Airlines computer failure has grounded flights nationwide since July 20 leaving passengers stranded or waiting for long delays as some 700 Southwest flights were cancelled nationally with more than 300 flights canceled by 8am today, according to the airline, with the number rising to about 450 by mid-afternoon. / AFP PHOTO / Frederic J. BROWNFREDERIC J. BROWN/AFP/Getty Images

Travellers check the departures screen for flights at the Southwest Airlines terminal at Los Angeles International Airport on July 21, 2016 in Los Angeles, California. A Southwest Airlines computer failure has grounded flights nationwide since July 20 leaving passengers stranded or waiting for long delays as some 700 Southwest flights were cancelled nationally with more than 300 flights canceled by 8am today, according to the airline, with the number rising to about 450 by mid-afternoon. / AFP PHOTO / Frederic J. BROWNFREDERIC J. BROWN/AFP/Getty Images

FILE - JULY 21, 2016: It was reported that Fox News chief Roger Ailes has resigned from the network following sexual harassment allegations July 21, 2016. Rupert Murdoch will assume the role of Chairman and acting CEO of Fox News Channel and Fox Business Network. SUN VALLEY, ID - JULY 10: Rupert Murdoch (L), and Lachlan Murdoch, co-executive chairmen of 21st Century Fox, attend the Allen & Company Sun Valley Conference on July 10, 2015 in Sun Valley, Idaho. Many of the worlds wealthiest and most powerful business people from media, finance, and technology attend the annual week-long conference which is in its 33rd year. (Photo by Scott Olson/Getty Images)

FILE - JULY 21, 2016: It was reported that Fox News chief Roger Ailes has resigned from the network following sexual harassment allegations July 21, 2016. Rupert Murdoch will assume the role of Chairman and acting CEO of Fox News Channel and Fox Business Network. SUN VALLEY, ID - JULY 7: Rupert Murdoch, Chief Executive Officer of News Corp, attends the annual Allen & Company Sun Valley Conference, July 7, 2016 in Sun Valley, Idaho. Every July, some of the world's most wealthy and powerful businesspeople from the media, finance, technology and political spheres converge at the Sun Valley Resort for the exclusive weeklong conference. (Photo by Drew Angerer/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images) *** BESTPIX ***

CLEVELAND, OH - JULY 20: A plane carrying republican presidential nominee Donald Trump flies over a crowd waiting at the Great Lakes Science Center on July 20, 2016 in Cleveland, Ohio. Republican presidential nominee Donald Trump gathered with running mate Mike Pence and their families at the Great Lakes Science Center on day three of the Republican National Convention. (Photo by Justin Sullivan/Getty Images) *** BESTPIX ***

A plane carrying republican presidential nominee Donald Trump flies over a crowd waiting at the Great Lakes Science Center on July 20, 2016 in Cleveland, Ohio. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

A plane carrying republican presidential nominee Donald Trump flies over a crowd waiting at the Great Lakes Science Center on July 20, 2016 in Cleveland, Ohio. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images