As you can see from the graph to the right (click to enlarge), which traces the percentage of UAL's (UAUA), (the parent of United Airlines) Market Cap on Loan (%MCOL), short interest has increased by 100% - from 8% MCOL in mid-May, to 16% today. Investors who increased their positions at the correct time will have made a very profitable trade, as the share price has halved - from 16USD on May 2nd to 8USD today. Utilisation is at 18% and there are 6 Days to Cover.
The average Utilisation for the rest of the North America Transportation sector is 13.54%, and for the rest of the US Small Caps it is 18.16%. AMR (NASDAQ:AMR), who own all of American Airlines' common stock, is also a heavily borrowed company, with 21% of their shares on loan to short investors. Utilisation is at 45% and there are 12.5 Days to Cover. Please see the graph (right) of AMR's short interest.