An air transport agreement is a bilateral agreement to allow international commercial air transport services between signatories. The bilateral system has its basis under the Chicago Convention and associated multilateral treaties. From Wikipedia
U.S. Department of Transport finds JetBlue and A4A's complaints against Dutch regulations aimed at limiting flights at Schiphol to 452,500 per year meritorious, causing further uncertainty for international airlines and potential increase in fares for transatlantic travelers.