berlin travel restrictions put place u.s. president donald trump seven countries deter travelers countries accord travel analysis company forwardkeys analyse 16 million flight reservations day major global reservation systems say book international arrivals unite state next three months 2.3 percent high last year jan. 27 day trump issue executive order book 3.4 percent ahead previous year forwardkeys data show travel ban place jan. 28 feb. book unite state drop 6.5 percent include 80 percent slump reservations seven countries list trump order 13.6 percent drop western europe day curb lift u.s. judge book iran surge forwardkeys say leave reservations travel unite state five time high feb. feb. two days year early book arrival unite state feb. feb. 6. forwardkeys ceo olivier jager caution data snapshot eight-day period would continue monitor situation group u.n. world tourism organization also warn travel demand could hurt u.s. restrictions still suspend pending u.s. appeal court hear due start 2300 gmt tuesday ambiguity late developments introduce president trump cast shadow future travel demand u.s. say nadejda popova travel project manager euromonitor new executive order could also impact u.s. perceive tourism destination open foreign travelers future trump travel restrictions hit demand visit u.s. study