Global Business Travel Market Size, Share & Demand Report By Travel Purpose (Corporate Internal Travel, Client-Related Travel, MICE Travel, Project-Based Travel, Government & Institutional Travel), By Booking Channel (TMCs, OTAs, Direct Bookings, Self-Booking Tools), By Service Type (Transportation, Accommodation, F&B/Per Diem, Meetings & Event Management, Travel Insurance), By Industry Vertical (IT & Telecom, BFSI, Manufacturing, Healthcare, Consulting, Government), By Region & Segment Forecasts, 2025–2030