Following the deal brokered in November, between Iran and the world’s six powers, The US Treasury Department has granted plane manufacturers Boeing and General Electric’s (GE) a license to export certain spare commercial parts to Iran despite the Mujahedin Khalq Organization (the MKO) put a heavy lobbying efforts to stop the deal working.
The step is being seen as part of a temporary agreement to ease sanctions on Tehran that US Secretary of State John Kerry reached with Iran last year, reported BBC. 
The MKO’s multi-million dollar champagne in the US Congress to oppose any deal to reach peace with Iran, launched particular champagne last November to increase sanctions on Iranian airlines. "America should exploit some of the vagaries in the agreement’s language and prevent Boeing from repairing Iranian aircraft until we have a final deal," Rep. Brad Sherman (D-Calif.) one of the MKO’s main sponsors in the Congress said in the statement he delivered in late November. "Otherwise we will have made a permanent irreversible concession in a ‘temporary’ agreement." 
Although Jason Ditz of the Antiwar properly concludes that the MKO "appears to still envision itself being the benefactors of US-imposed regime change in Iran, and is willing to pull out all the stops to see to it that diplomacy does not succeed and rapprochement remains impossible", this time diplomacy seems to work out.
The MKO leaders are right to panic peace because the truth is showing its ugly face to them now.
 BBC, US allows Boeing airplane component sales to Iran, April 4, 2014
Pecquet, Julian, Dem to Obama: Don’t fix Iran’s airplanes, The Hill, November 26, 2013
Ditz, Jason, Mujahedin-e Khalq Opposes Iran Deal, Pushes Sanctions ,MeK-Paid Officials Blast Deal as ‘Appeasement’ , January 29, 2014