A drop-off can be in travel.Logical formLearned from22 sentences. A (travel slump) can be global.Logical formLearned from22 sentences. (Travel times) may pertain-to a year.Logical formLearned from22 sentences. A warning can be on travel.Logical formLearned from22 sentences. (Travel plans) may pertain-to persons.Logical formLearned from22 sentences. A drop-off can be in (business travel).Logical formLearned from22 sentences. (Travel costs) can be international.Logical formLearned from22 sentences. Travel may undergo a flow.Logical formLearned from22 sentences. (Air travel) can be impossible.Logical formLearned from22 sentences. Travel may fall.Logical formLearned from22 sentences. Restrictions can be on travel to a country.Logical formLearned from22 sentences. An (air travel) can be worldwide.Logical formLearned from22 sentences. (Air travel) may undergo a suspension.Logical formLearned from22 sentences. Warnings can be against travel to a country.Logical formLearned from22 sentences. Travel can be widespread.Logical formLearned from21 sentences.