Indonesia had planes flying again on Tuesday after a volcanic eruption forced the country’s major airports to close for days, with authorities saying that flights would resume gradually.The disruption, caused by the eruption of Anak Krakatoa, halted nearly 3,000 flights and stranded more than 340,000 passengers.Ash from Anak Krakatoa, which sits halfway between ‌Java and Sumatra islands, has blanketed Jakarta and some surrounding areas since its initial eruption late on Friday.The country’s main airport serving the capital Jakarta and four other airports reopened early on Tuesday after authorities cleared volcanic ash from critical infrastructure.Transport Minister Dudy Purwagandhi told reporters it would take time for flight schedules to return to normal.Dudy said there were around 178 aircraft at Soekarno-Hatta International Airport, Jakarta’s main air travel hub.