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Following a goalless first half, Swanson broke the deadlock 12 minutes after the break to earn the US their first Olympic title since London 2012 after a perfect run in the tournament.
Dos Santos, who finished 11th, ended his Olympic run on a memorable note, falling to one knee to propose to his girlfriend in front of the crowd.
Video shared on social media showed the ATR-72 aircraft spinning out of control as it plunged down behind a cluster of trees near houses.
Ayres was electrocuted during a live performance at the Solar Hotel in Salinópolis.
Marcelo Bielsa's Uruguay were reduced to 10 men in the second half but kept Brazil at bay in regulation time before beating them 4-2 on penalties to advance to the semifinals where they will play Colombia.
Uruguay, who finished the game with 10 men after Nahitan Nandez was sent off in the 74th minute, will face Colombia in the last four.
Vinicius Jr is suspended for accumulating yellow cards.
Brazil, who finished second in Group D, take on Uruguay for a place in the semifinals.
Despite the searing California heat neither side let the intensity drop after the break.
Colombia top Group D with six points after two matches, with Brazil in second on four points.
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