Only 76 percent of flights touched down when they were supposed to in 2010, putting Logan 25th out of 29 airports; in 2009, Logan came in 22d with the same rate. .
Logan fared better with departures, coming in 12th with 81 percent of flights leaving on time; in 2009, 82 percent of planes took off on schedule for a 13th place ranking.
JetBlue Airways, Logan's biggest carrier, is largely to blame for Logan's poor performance. Just 76 percent of its flights arrived on time, putting the airline second to last among 18 carriers, according to the US Department of Transportation.
Seattle-Tacoma International Airport topped all other airports in both categories last year, with 85 percent of arriving planes and 88 percent of departing planes hitting the mark. The No. 1 airline was Hawaiian Airlines, which had a 93 percent on-time rate, followed by Alaska Airlines with 88 percent and United Airlines with 85 percent.