The F-14A was the initial two-seat, twin-engine, all-weather interceptor fighter variant for the U.S. Navy. It first flew on 21 December 1970. Modifications late in its service life added precision strike munitions to its armament. The U.S. Navy received 478 F-14A aircraft and 79 were received by Iran.The final 102 F-14As were delivered with improved Pratt & Whitney TF30-P-414A engines. Additionally, an 80th F-14A was manufactured for Iran, but was delivered to the U.S. Navy.
The F-14 received its first of many major upgrades in March 1987 with the F-14A Plus (or F-14A+). The F-14A's TF30 engine was replaced with the improved F110-GE-400 engine. The F-14A+ also received the state-of-the-art ALR-67 Radar Homing and Warning (RHAW) system. Many of the avionics components, as well as the AWG-9 radar, were retained. The F-14A+ was later designated F-14B on 1 May 1991. A total of 38 new aircraft were manufactured and 48 F-14A were upgraded into B variants. In the late 1990s, 67 F-14Bs were upgraded to extend airframe life and improve offensive and defensive avionics systems.