1. Delta's sale fares, which cover its domestic system , require no advance purchase. 2. We have good contractors at all of the screening checkpoints in our domestic system , 3. Northwest on Thursday raised round-trip fares throughout its domestic system . 4. But an unevenly distributed domestic system serves principal cities, industrial centers, and many towns. 5. Yugoslav artillery regiments were well equipped with Soviet, U . S . and domestic systems . 6. Some systems allow a credit when the tax would be properly chargeable under the domestic system . 7. In the hub-and-spoke domestic system , matching passengers and bags for connecting flights would be a nightmare. 8. Many " off-the-grid " domestic systems rely on battery storage ( see Battery storage power station ). 9. The move, announced Thursday, is part of a plan to cut unprofitable routes and realign Delta's domestic system . 10. Before the First industrial revolution work was mainly done through two systems : domestic system and craft guilds.