(Travel disruption) may be sparked by volcanic ash.Logical formLearned from3 sentences. An airspace can be due to a cloud of volcanic ash.Logical formLearned from3 sentences. Engines can be from a volcanic ash.Logical formLearned from3 sentences. Volcanic ash may drift from a volcanic eruption.Logical formLearned from3 sentences. Risks may be posed by volcanic ash.Logical formLearned from3 sentences. A volcanic eruption may fire ash.Logical formLearned from3 sentences. Volcanic ash may sweep across a continent.Logical formLearned from3 sentences. A cloud of volcanic ash may sweep over a continent.Logical formLearned from3 sentences. A volcanic eruption may last a time.Logical formLearned from3 sentences. Volcanic ash can be dangerous for aircraft.Logical formLearned from3 sentences. A volcanic ash can be from an eruption.Logical formLearned from3 sentences. Fears can be over a cloud of volcanic ash.Logical formLearned from3 sentences. A volcanic eruption can be in the south of a country.Logical formLearned from3 sentences. A problem can be a volcanic ash.Logical formLearned from3 sentences. A volcanic eruption can be in some years.Logical formLearned from3 sentences.