Obama's Dept of Transport finally prohibits smoking ecigs on airplanes; how about the FDA?

According to the Associated Press, the Department of Transportation finally allowed the Department of Transportation to prohibit the use of e-cigarettes on airplanes.  It has taken years to get this rule and it comes after all the US airlines I have flown on recently already voluntarily prohibited using e-cigs on their flights.
 
Now that the White House Office of Management and Budget has let DOT do this, it is past time for them to approve the FDA "deeming rule" that has been sitting at OMB for months (since October 2015).  Early last year FDA officials were saying to expect the rule by June 2015.  It is not March 2016.  In the mean time, youth use continue to explode and the evidence that e-cigs inhibit adult quitting keeps piling up.