On se po obimu već smatra većim i s negativnijim posljedicama po ekonomiju od prisilne obustave letova nakon terorističkih napada 11. septembra u Njujorku i Vašingtonu, kad je zračni prostor SAD bio zatvoren tri dana.
It has already been deemed bigger in scale and negative effect on the economy than the forced suspension of flights in the wake of the September 11th 2001 terrorist attacks in New York and Washington when US airspace was closed for three days.