Passage is a long narrow space with walls connecting places. A passage in a book, speech, or music is a separate section. A passage in a body is a narrow tube for air or liquid. A passage through a crowd is an empty space for movement
Smooth surface lacks roughness, lumps, or holes. Smooth liquid or mixture is well-mixed without lumps. Smooth drink is pleasant and not bitter. Smooth line or movement has no sudden changes. Smooth ride or flight is comfortable with no unpleasant movements
Transit means staying in same airport with same plane. Transfer involves switching planes or airports during layover. Transit luggage goes directly to final destination. Transfer may require luggage handling between flights
Transit (C) visas allow continuous travel through the United States en route to another country. Immediate transit means departing in normal course without unreasonable layovers. Valid visitor (B) visa holders may transit with certain exceptions. Citizens of participating countries can transit through Visa Waiver Program
EU, EEA and Swiss citizens need valid passport for UK entry. Irish citizens can use national ID cards. EU/EEA/Swiss citizens can stay up to 6 months visa-free. Non-EU/EEA/Swiss citizens may need Standard Visitor visa. Electronic Travel Authorisation (ETA) required for most non-visa visitors
Change or shift from one state, subject, place to another. Period or phase during such a change. Something that links one state to another