The pilot's small plane trailed a banner reading: "RAISING TAXES IS NOT PATRIOTIC." That referred to a call Thursday from Obama's running mate Joseph Biden for richer Americans to pay more in taxes for the national good.
The sign was the only discordant note as the huge crowd gave a rapturous welcome to Obama in a park in Jacksonville, northeastern Florida.
An official estimate for turnout was still awaited but it numbered several thousand, with thousands more still queuing up outside the security checkpoints.