From the Latest Campaign Filing

Thousands of dollars of Northwest Airlines and Jet Blue tickets to fly in what the campaign calls "late help": ringers who have worked with the campaign and wanted to be there in the election's endgame . According to the Bloomberg campaign, at least a portion of those flown in (commercial, not corporate, mind you) were summer interns who came back from college to volunteer in canvasing operations. The campaign also paid for tens of thousands of dollars in Metrocards and Enterprise Rent-A-Cars to help out canvasers with more traditional transportation.