With the NFL Super Bowl and PyeongChang 2018 winter Olympic Games looming, US national network NBC said it is expecting record ad sales of more than $1.4 billion. 

The broadcaster has sold all but a handful of 30-second television spots, for which it is charging an average of more than $5 million, for the 4 February Super Bowl in Minneapolis.

Dan Lovinger, executive vice-president of advertising sales at NBC Sports Group, said the broadcaster is anticipating a single-day revenue record for any media company for the Super Bowl, while more than $900 million is expected to be garnered from national advertising sales for the winter Olympics, which run from 9 to 25 February.

The Super Bowl traditionally ranks as the most-watched event on the US TV calendar, and last year's game, broadcast by Fox, drew 111.3 million viewers, slightly down from the 111.9 million a year earlier on rival CBS. 

Sportcal