9 3 0 s , ▁architect s ▁designed ▁Art ▁Dec o ▁style ▁buildings ▁in ▁Miami ▁Beach . ▁Vis itors ▁are ▁still ▁attract ed ▁to ▁the ▁Art ▁Dec o ▁district ▁of ▁Miami . ▁Th eme ▁par ks ▁were ▁soon ▁built ▁across ▁Florida . ▁One ▁of ▁the ▁largest ▁resort s ▁in ▁the ▁world , ▁W alt ▁Disney ▁World ▁Res ort , ▁was ▁opened ▁near ▁Or lando , ▁Florida ▁in ▁ 1 9 7 1 . ▁In ▁its ▁first ▁year , ▁the ▁ ▁park ▁added ▁$ 1 4   b ill ion ▁to ▁Or lando ' s ▁economy . ▁ ▁Late ▁ 2 0 th ▁century ▁ ▁The ▁revolution ▁of ▁air ▁travel ▁between ▁ 1 9 4 5 ▁and ▁ 1 9 6 9 ▁contributed ▁greatly ▁to ▁tour ism ▁in ▁the ▁United ▁States . ▁In ▁that ▁quarter ▁century , ▁commercial ▁av iation ▁evol ved ▁from ▁ 2 8 - pass enger ▁air lin ers ▁flying ▁at ▁less ▁than ▁ ▁to ▁ 1 5 0 - pass enger ▁jet lin ers ▁cru ising ▁contin ents ▁at ▁. ▁During ▁this ▁time , ▁air ▁travel ▁in ▁the ▁U . S . ▁evol ved ▁from ▁a ▁novel ty ▁into ▁a ▁routine ▁for ▁business ▁travel ers ▁and ▁vac ation ers ▁al ike . ▁Rap id ▁develop ments ▁in ▁av iation ▁technology , ▁economic ▁prosper ity ▁in ▁the ▁United ▁States ▁and ▁the ▁demand ▁for ▁air ▁travel ▁all ▁contributed ▁to ▁the ▁early ▁beg inn ings ▁of ▁commercial ▁av iation ▁in ▁the ▁US . ▁ ▁During ▁the ▁first ▁four ▁dec ades ▁of ▁the ▁tw