Updated 12:16 p.m. March 16, 2011 with comments from McCaskill.
Missouri Senator Claire McCaskill says she is embarrassed by the recent revelation that she was reimbursed for using a private airplane to attend a political event in 2007.
The democrat's comments come a day after the Missouri Republican Party filed an ethics complaint against her.
Despite a campaign ad attacking the practice, Governor Jay Nixon says he has no plans to scale back his air travel.
Earlier this week the Missouri Republican State Committee began airing radio spots criticizing the Democratic governor’s air travel, dubbing him “Air Jay.”
Governor Nixon also has come under fire from the legislature and the state’s auditor, for billing state agencies for his trips on state planes, about $400,000 over two years.
Missouri House members have voted without dissent to require information about the governor's travel to be posted on a state website.
The Missouri Department of Transportation is urging driver to take it slow and be careful if they must travel this Christmas night.
St. Louis Public Radio is a service of the University of Missouri-St. Louis.