At long last, US Customs has announced that all ocean, rail and airports are accepting ACE Cargo Release (formerly known as Simplified Entry). All truck ports will soon follow on April 13 (truck ports currently accepting ACE Cargo Release include Blaine, WA; Brownsville, TX; Buffalo, NY; Champlain, NY; Detroit, MI; Del Rio, TX; Eagle Pass, TX; El Paso, TX; Laredo, TX; Nogales, AZ; and Port Huron, MI)
As noted in the accompanying CBP chart, capabilities for handling PGA data and Remote Location Filing (RLF) at all ports are coming soon.