If you haven't started your Thanksgiving trip, you're not alone. The busiest days are still to come

Holiday travelers are starting their final sprint. About 2.7 million people were expected to board flights on Wednesday, and Sunday is expected to set an all-time record of 2.9 million. Many millions of other Americans will drive to Thanksgiving celebrations. Airlines and the Federal Aviation Administration say they are prepared for the onslaught. But airport security lines could be long. Delta is telling passengers to arrive at the airport at least two or three hours before their flight. On the positive side, the government says airfares are lower than they were last year, and gasoline prices are down too.