The short answer is yes. It is possible to exit and reenter the airport. Whether or not you should depends on a range of factors, including if you're traveling internationally or domestically and how much time you have between flights.

The jet engines for the Boeing 777 and 787 Dreamliner are manufactured by two of the world's leading aerospace engineering firms: General Electric (GE Aerospace) and Rolls-Royce. For the Boeing 777 family, GE is the dominant provider; the GE90 engine was developed specifically for the 777-200 and -300 series, while the GE9X is the exclusive engine for the newer 777X. For the Boeing 787 Dreamliner, airlines can choose between two different engine types: the GEnx-1B from General Electric or the Trent 1000 from Rolls-Royce. These engines are "interchangeable" on the airframe, meaning an airline can order the same 787 model but choose the engine manufacturer based on their existing fleet maintenance preferences. Interestingly, while Pratt & Whitney is a major player in the narrowbody market (like the A320neo), it does not currently provide engines for these specific Boeing widebody models. These massive powerplants are marvels of modern engineering, utilizing carbon-fiber blades and high-bypass designs to achieve the fuel efficiency and range that define 2026's long-haul travel.

Technically, you can leave the airport after you have entered the departures area (post-security), but it is a logistically difficult and time-consuming process. To do so, you must find a way back through the "one-way" security gates, which often requires a security or airline escort to ensure you are not bypassing customs or immigration. If you are on an international flight, you would have to essentially "un-enter" the country, which involves a complicated process with border control. Furthermore, if you leave, you will have to clear security again upon your return, which could take a significant amount of time. If you have already checked a bag, the airline may be required by law to offload it for security reasons if you are not at the gate, which could lead to your flight being delayed or your bag being left behind. Generally, unless there is a massive flight delay (8+ hours), leaving the "sterile" area is discouraged and could cause you to miss your flight.