New rules take effect beginning May 13, 2009 regarding Oxygen for traveling patients. Below are a couple excerpts that discuss mandating of all air carriers to allow the use of Portable Oxygen Concentrators.
http://www.dotcr.ost.dot.gov/asp/airacc.asp
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Summary from Federal Register / Vol. 73, No. 93 / Tuesday, May 13, 2008 / Rules [...]