Fans have begun taking their seats for Super Bowl as the Denver Broncos and Seattle Seahawks are set to begin their NFL championship showdown.
More than 79,000 spectators are set to fill the $US1.7 billion MetLife Stadium, the regular-season home of the New York Jets and New York Giants, for the NFL title game.
Cloudy skies and a brief misty rain greeted early arriving fans, most of whom wore jackets and hats in the first outdoor Super Bowl in a cold-weather city.
But fears of a blizzard or bitter cold did not come to pass. Temperatures near 6.5C were expected for the evening kickoff and the game was expected to end before they fall to the level of the coldest-ever Super Bowl from 1972, an unusually chilly 3.8C in New Orleans.
Orange-clad Broncos supporters and Seattle's "12th Man", the notoriously loud fans from across the country wearing blue, were chanting cheers and serving notice early they would be screaming for their teams well into the night.
Every seat was adorned with a cushion that included a special hat for the half-time show and warmers that activate with a hard impact to provide thermal relief for cold spectators.
While there were 11,000 parking places sold for the game, security and television equipment took up much of the usual space around the stadium, prompting mass transit trains and buses to be used by an expected 30,000 people.
Delays began at the security entry areas as lengthy lines formed for inspections of people and bags for one of the major top-level US security events of every year.
Tall pillars with video screens and loudspeakers were in place to entertain fans as they waited, using music and highlights from the Broncos and Seahawks as well as provide facts about the game, such as this being the least popular US wedding weekend and more than 1.5 million televisions being sold in America in the week before the big game.
Warming stations found few takers thanks to moderate conditions, but such fan fun areas as an American football-themed obstacle course and a giant NFL video game attracted long lines.
But lines were 20-people deep in food areas for $US12 ($A13.70) US beers and $US14-16 for imports, $US14 for Italian sausage, $US16 for cheesesteaks, $US18 for foot-long hot dogs, noodle bowls for $US11 or $US20 if you want the souvenir version, dumplings for $US7, $US11 for tacos or burritos and peanuts and bottled water for $US6 each.
