Senators John Thune (R-SD) and Claire McCaskill (D-MO) released a letter September 4 requesting swift action on their bill – the European Union Emissions Trading Scheme Prohibition Act of 2011 (S.1956). The measure would excuse American airlines from having to purchase emission allowances in accordance with the European Union’s emissions trading system for U.S. flights arriving in or departing from Europe. The House approved a similar bill (H.R. 2594) last October.