A slump can be in (business travel).Logical formLearned from19 sentences. A (travel warning) can be to a country.Logical formLearned from19 sentences. Travels may pertain-to persons.Logical formLearned from19 sentences. Flights can be for an (air travel market).Logical formLearned from19 sentences. (Travel businesses) may be controlled by a family.Logical formLearned from19 sentences. A series can be constituted-of-or-filled-with (travel advisories).Logical formLearned from19 sentences. Travel can be by foreigners.Logical formLearned from19 sentences. A (travel warning) can be for a world-city.Logical formLearned from19 sentences. A country may advise against travel.Logical formLearned from19 sentences. A country may warn against travel to a country.Logical formLearned from19 sentences. (Travel restrictions) may cripple the palestinian economy.Logical formLearned from19 sentences. A disruption can be in (air travel).Logical formLearned from19 sentences. (Travel documents) may pertain-to a country.Logical formLearned from19 sentences. A (travel warning) can be revised.Logical formLearned from19 sentences. Countries may issue (travel warnings).Logical formLearned from19 sentences.