Pakistan recently bought 13 older F-16A fighters from Jordan. These F-16As had recently undergone a mid-life update and have, on average, 3,000 flight hours left. This increases the Pakistani F-16 fleet to 76 aircraft. This is far less than the Indian Su-30 fleet (over 200 and headed for 300 in the next few years), but every F-16 helps Pakistan in a potential air war with India.
Meanwhile Jordan has also been buying Cold War surplus F-16s to update its own air force. Back in 2006 Jordan bought 20 Cold War F-16s from the Netherlands. Jordan already had 35 used F-16s (from the United States and the Netherlands.) Most of these aircraft are upgraded with late model radars and electronics. Jordan got all these aircraft at about a third the price of new aircraft. Even with the recent sale to Pakistan that still leaves 46 F-16Cs in the Jordanian air force.
Pakistan also has a growing number of more modern F-16s. Back in 2012 they received three F-16 Block 52 fighters. These are all-weather aircraft that are particularly effective at night. These were the first all-weather fighters the Pakistani Air Force had received and another 15 of these aircraft were delivered by 2011. Pakistan had operated 40 F-16 since the 1990s, but was barred from buying any more after Pakistan revealed that it had nuclear weapons in 1998. That embargo was lifted in 2005 and another 14 F-16s were delivered by 2008.
Pakistan also hired a Turkish firm to upgrade its older F-16s from Block 15 configuration to Block 40 (about halfway to the highest upgrade level for an F-16). Now that the U.S. has lifted its arms embargo on Pakistan, there are many firms competing for all the work needed to update older American weapons still used by Pakistan. The Turks have long had good trade relations with Pakistan, and have also developed, with the help of the U.S. and Israel, a growing aircraft maintenance and upgrade industry. Most of the F-16 work was be done in Pakistan using Turkish engineers and technicians supervising some local workers and using largely imported (from Turkey and elsewhere) components. Turkey has long maintained one the largest F-16 fleets outside of the United States.
The F-16 is the most numerous post-Cold War jet fighter, with over 4,200 built, and still in production. During The Cold War, Russia built over 10,000 MiG-21s, and the U.S over 5,000 F-4s. Since the 1980s warplane production has plummeted about 90 percent. Yet since the end of the Cold War in 1991 the F-16 has been popular enough to keep the production lines going.
The U.S. F-16 is one of the most modified jet fighters in service. While most are still called the F-16C, there are actually six major mods, identified by block number (32, 40, 42, 50, 52, 60), plus the Israeli F-16I, which is a major additional modification of the Block 52. Another special version (the Block 60), for the UAE (United Arab Emirates) is called the F-16E. The F-16D is a two seat trainer version of F-16Cs. The various block mods included a large variety of new components (five engines, four sets of avionics, five generations of electronic warfare gear, five radars and many other mechanical, software, cockpit and electrical mods.)
The F-16 can also function as a bomber and ground attack aircraft, although not as effectively as the air force would have you believe. It can carry four tons of bombs. In air-to-air combat, it has shot down 69 aircraft so far, without losing anything to enemy warplanes. It was originally designed as a cheaper alternative to the heavier F-15.
The two most advanced versions of the F-16 are in use by foreign air forces. The UAE has 80 "Desert Falcons" (the F-16E) which is optimized for air combat. It is a 22 ton aircraft based on the Block 52 model, but with an AESA (phased array) radar and lots of other additional goodies.
The Israeli F-16I is optimized for bombing. It's a 24 ton, two seat aircraft, and is probably the most capable F-16 model in service. It's basically a modified version of the Block 52, equipped with a more advanced radar (the APG-68X) and the ability to carry Israeli weapons like the Python 4 air-to-air missile and the Popeye 2 air-to-surface missile. Costing $45 million each, the F-16I has an excellent navigation system, which allows it to fly on the deck (a few hundred feet from the ground), without working the pilot to death. The aircraft can do this at night or in any weather. The F-16I can carry enough fuel to hit targets 1,600 kilometers away (meaning Iran is within range). The aircraft uses the latest short and long range air-to-air missiles, as well as smart bombs. Electronic countermeasures are carried, as is a powerful computer system, which records the details of each sortie in great detail. This is a big help for training. The F-16I is basically optimized to deliver smart bombs anywhere, despite dense air defense
Since 2008 Pakistani F-16s have been heavily used in the tribal territories, along the Afghan border, dropping smart and dumb bombs, and giving the pilots experience using targeting pods. This is the first combat experience the Pakistani F-16s have received and the Pakistanis are satisfied with F-16 performance as a bomber.