Or they could just build an air side people mover and connect to t3 as well. Thus no need to clear customs take the apm and clear security again for t3 to/from t1 connections. Might require some funky security set ups to deal with all the possible permutations, (dom-itl/usa/inter terminal dom, intl-usa/dom/inter terminal intl, and usa-dom/intl/inter terminal usa.