Here's an interesting read. According to one opinion, it seems that the issue with air traffic tower closings might not be so much about 'how many' are closing, but 'which ones'. It seems that the ones chosen for closure are all staffed by contracting companies, whereas the ones being spared are run by the union, the National Air Traffic Controllers Association.
The Federal Aviation Administration spared 24 towers on its original list of 173 subject to closing, it said in an email Friday. All towers being shut down are run by private companies, not the government as at larger facilities. [Oakland Press]