But is that an increase or is there always an average 10 such happenings a day amongst the who knows how many (thousands, tens of thousands?) of flights a day? (ok i googled it )
: At any given moment, roughly 5,000 planes are in the skies above the United States. In one year, controllers handle an average of 64 million takeoffs and landings.
http://www.natca.org/mediacenter/bythenumbers.msp now to do the math (maths for you UKers
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3650/64,000,000=0.00005703125 hmm not bad odds at all, they always have said that flying is statically the most safe form of travel.