Air America Radio seems to be off the air in Chicago for the time being. My first inkling that there was a problem came a couple of weeks ago when I flipped on the radio to 950 AM and heard what sounded like Cantonese talk radio coming out of the speaker. Apparently a financial dispute led the station's owner to pull the plug; a court injunction put the station back on the air through April 30, but now it's gone for good.