▁April , ▁NAT O ▁reported ▁finding ▁mol ten ▁glass ▁in ▁the ▁engines ▁of ▁at ▁least ▁one ▁F - 1 6 , ▁the ▁result ▁of ▁flying ▁through ▁the ▁ash ▁cloud , ▁leading ▁to ▁the ▁scaling - down ▁of ▁U . S . ▁military ▁exer cis es . ▁Royal ▁Air ▁Force ▁fl ights ▁to ▁Sel ly ▁Oak ▁Hospital ▁in ▁B irmingham ▁were ▁ground ed , ▁and ▁the ▁United ▁Kingdom ▁Ministry ▁of ▁Def ence ▁considered ▁flying ▁British ▁cas ual ties ▁of ▁the ▁Afghan ▁War ▁to ▁coal ition ▁countries . ▁ ▁On ▁ 2 3 ▁April ▁it ▁was ▁announced ▁that ▁British ▁Royal ▁Air ▁Force ▁training ▁fl ights ▁had ▁been ▁susp ended ▁following ▁vol can ic ▁ash ▁damage ▁to ▁the ▁engines ▁of ▁Euro fig h ter ▁Ty ph oon ▁aircraft . ▁ ▁Imp act s ▁of ▁the ▁dis ruption ▁▁ ▁The ▁dis ruption ▁acceler ated ▁the ▁integration ▁of ▁the ▁national ▁air ▁traffic ▁control ▁systems ▁into ▁the ▁Single ▁European ▁Sky ▁and ▁the ▁immediate ▁creation ▁of ▁a ▁crisis ▁coord ination ▁group ▁to ▁handle ▁future ▁transport ation ▁dis ru ptions . ▁ ▁The ▁ash ▁indirect ly ▁affected ▁many ▁scheduled ▁cultural ▁and ▁sport ing ▁events ▁because ▁key ▁participants ▁were ▁unable ▁to ▁attend , ▁including ▁the ▁fun eral ▁of ▁Polish ▁president ▁Le ch ▁K ac zy ński ▁in ▁Krak ów ▁on ▁ 1 8 ▁April ▁ 2 0 1 0 . ▁ ▁The ▁fun eral ▁was ▁to ▁have ▁been ▁attended ▁by ▁ 6 9   pres idents , ▁prime ▁minister s , ▁and ▁other ▁heads ▁of ▁states . ▁ ▁Al most ▁half ▁of