Actually, that wouldn't work.
Not only do FAE bombs require a carefully calibrated mix of fuel and air to work properly (which would be impossible to achieve with a spray from a flying plane), but simply setting them off with a "flare" wouldn't work either. In order to achieve the "big boom" effect, the fuel-air cloud needs to be ignited by a high explosive -- it's the self-propagating high-speed wave front that makes an FAE bomb so devastating. If you just light it off with a match, you'll get a big fire and the kind of "whoomp" you get from gasoline vapors when you toss a match into a puddle of gasoline, but not the truly explosiving, shattering explosion that results from a traveling wave front of ignition.