F/A-18A and F/A-18B
The F/A-18A is the single-seat variant and the F/A-18B is the two-seat variant. The space for the two-seat cockpit is provided by a relocation of avionics equipment and a 6% reduction in internal fuel; two-seat Hornets are otherwise fully combat-capable. The B-model is used primarily for training.
F/A-18C and F/A-18D
The F/A-18C is the single-seat variant and the F/A-18D is the two-seat variant. The D-model can be configured for training or as an all-weather strike craft. The "missionized" D model's rear seat is configured for a Marine Corps Naval Flight Officer who functions as a Weapons and Sensors Officer to assist in operating the weapons systems. The F/A-18D is primarily operated by the U.S. Marine Corps in the night attack and Forward Air Controller (Airborne) (FAC(A)) roles.
F/A-18E and F/A-18F
The single-seat F/A-18E and two-seat F/A-18F, both officially named Super Hornet, carry over the name and design concept of the original F/A-18 but have been extensively redesigned by McDonnell Douglas. The Super Hornet has a new, 25% larger airframe, larger rectangular air intakes, more powerful GE F414 engines based on F/A-18's F404, and an upgraded avionics suite. Like the Marine Corps' F/A-18D, the Navy's F/A-18F carries a naval flight officer as a second crew member in a weapon systems officer (WSO) role. The Super Hornet is unofficially known as "Rhino" in operational use. This name was chosen to distinguish the newer variants from the legacy F-18A/B/C/D Hornet and avoid confusion during carrier deck operations. The Super Hornet is also operated by Australia.
Boeing EA-18G Growler
The EA-18G Growler is an electronic warfare version of the two-seat F/A-18F, which entered production in 2007. The Growler has replaced the Navy's EA-6B Prowler and carries a Naval Flight Officer as a second crewman in an Electronic Warfare Officer (EWO) role.
F-18(R)
This was a proposed reconnaissance version of the F/A-18A. It included a sensor package that replaced the 20 mm cannon. The first of two prototypes flew in August 1984. Small numbers were produced.
RF-18D
Proposed two-seat reconnaissance version for the US Marine Corps in the mid-1980s. It was to carry a radar reconnaissance pod. The system was canceled after it was unfunded in 1988. This ability was later realized on the F/A-18D(RC).
TF-18A
Two-seat training version of the F/A-18A fighter, later redesignated F/A-18B.
F-18 HARV
Single-seat High Alpha Research Vehicle for NASA. High angles of attack using thrust vectoring, modifications to the flight controls, and forebody strakes.
X-53 Active Aeroelastic Wing
A NASA F/A-18 has been modified to demonstrate the Active Aeroelastic Wing technology, and was designated X-53 in December 2006.
F-18L
A proposed land-based export version of the single-seat F-18A with air-superiority and attack capabilities. This variant was to be lightened by the removal of carrier landing capability and assembled by Northrop. Customers preferred the standard Hornet and the F-18L never entered mass production.
(A)F/A-18A/B
"F/A-18A" was the original company designation, designations of "AF-18A" & "ATF-18A" have also been applied. Assembled in Australia (excluding the first two (A)F/A-18Bs) by Aero-Space Technologies of Australia (ASTA) from 1985 through to 1990, from kits produced by McDonnell Douglas with increasing local content in the later aircraft. Originally the most notable differences between an Australian (A)F/A-18A/B and a US F/A-18A/B were the lack of a catapult attachment, replacing the carrier tailhook with a lighter land arresting hook, and the automatic carrier landing system with an Instrument Landing System. Australian Hornets have been involved in several major upgrade programs. This program called HUG (Hornet Upgrade) has had a few evolutions over the years. The first was to give Australian Hornets F/A-18C model avionics. The second and current upgrade program (HUG 2.2) updates the fleet's avionics even further. Since 2019 9 AF-18A have been delivered to Canada to be converted as CF-18A.
CF-18 Hornet
CF-18A: Single-seat fighter/attack version for the Royal Canadian Air Force. The official Canadian designation is CF-188A Hornet.
CF-18B: Two-seat training and combat version for the Royal Canadian Air Force. The official Canadian designation is CF-188B Hornet.
EF-18 Hornet
EF-18A: Single-seat fighter/attack version for the Spanish Air Force. The Spanish Air Force designation is C.15. They were first upgraded to the EF-18A+ version in 1992 and from 2003 to 2004 to 2013 they were locally upgraded by EADS CASA and Indra Sistemas with better avionics, TPAC, data presentation, navigation, software and ECM suit. The AN/APG-65 radar was upgraded to the V3 version and the aircraft also received the AL-400 Radar Warning Receiver and the ASQ-600 emission detector and were certified to operate with Iris-T, Meteor, GBU-48 and Taurus . This version is locally known as EF-18M/C.15M.
EF-18B: Two-seat training version for the Spanish Air Force. The Spanish Air Force designation is CE.15. They were first upgraded to the EF-18B+ version in 1992.
KAF-18 Hornet
KAF-18C: Single-seat fighter/attack version for the Kuwait Air Force.
KAF-18D: Two-seat training version for the Kuwait Air Force[
F-18C/D Hornet
The Finnish Air Force uses F/A-18C/D Hornets, with a Finland-specific mid-life update. The first seven Hornets (D models) were produced by McDonnell Douglas. The 57 single-seat F-18C model units were assembled by Patria in Finland. These variants were delivered without air-to-ground capability so the letter A was dropped from the name. They were later upgraded to carry air-to-ground weaponry.
F-18C/D Hornet
Switzerland uses F-18C/D, later Swiss specific mid-life update. The Swiss F-18s had no ground attack capability originally, until hardware was retrofitted