The US Navy will pay Raytheon $33 million for 10 sonar systems that helicopters can use to detect enemy submarines.

The Tewksbury-based defense contractor said Tuesday that it could reap as much as $98 million if the Navy chose to buy more systems for itself or allied militaries. Since 2002, the company has sold the Navy 130 AN/AQS-22 Airborne Low Frequency Sonar systems, or ALFS, under a previous version of the contract.More →