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Muscat kinda has an 'amusing' side, when u have to take gates to go towards countries like India, u merely go toward a place with two smalls duty free shops, as big as groceries, and then blank random waiting rooms at each gates. When u have to go toward European countries, u cross a loooong place with lots of restaurants café with lots of seats with nice view over planes and quite big and luxury duty free area to reach ur gate. ^^
Mumbai new Terminal 2, for international flights, really particularly is beautifull and pleasant.