Kaiser, the winner of last year's Kobuk 440, arrived at the White Mountain checkpoint at 12:39 p.m. At 12:48, Schandelmeier, a two-time Yukon Quest winner, joined him.
Judy Currier was third to arrive at 1:29 p.m., followed by Michelle Phillips at 1:50 p.m., Louis Ambrose at 2:56 p.m. and Aaron Burmeister at 3:59.
Mushers must take an eight-hour layover at White Mountain before mushing the final 77 miles to the finish line in Nome.
The 450-mile race honors Iditarod veteran and long-time Norton Sound Sled Dog Club member Paul Johnson, who died of cancer in October. It started Wednesday in Unalakleet.
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