In 1961, President John F. Kennedy accepted a modified, dark blue, 1961 Lincoln Continental that cost almost $200,000 (equivalent to about $1,700,000 in 2019).
 Assigned the Secret Service code name of X-100, it was the most sophisticated presidential state car yet built.
 The car included a "heavy-duty heater and air conditioner, a pair of radiotelephones, a fire extinguisher, a first-aid kit, and a siren."
 The exterior featured improved, retractable standing platforms and handles for Secret Service agents, and flashing red lights recessed into the bumper.
 Unique to the X-100 were three sets of removable roofs (a standard soft top, a lightweight metal one, and a transparent plastic one) and a hydraulic lift that raised the rear cushion 10 ¹⁄₂ inches (270 mm) off the floor.
 Both of these feature sets were designed to make the president more visible to the public, but they also increased the president's vulnerability (e.g. the assassination of John F. Kennedy).
 After the assassination, the X-100 was redesigned for an estimated cost of $500,000; the car was painted black and featured "improved telecommunications gear, a more powerful engine and flat-proof tires made of rubber-coated aluminum."
 The fuel tank was protected against explosion by a "porous foam matrix" that minimized spillage in the event of a puncture.
 The passenger compartment was protected by 1,600 pounds (730 kg) of armor, and the three removable roofs were replaced by a fixed glass enclosure that cost more than $125,000.
 The glass enclosure was made of 13 different pieces of bulletproof glass ranging in thickness from 1 to 1 ¹³⁄₁₆ inches (25 to 46 mm), and was then the largest piece of curved bulletproof glass ever made.
 In 1967, the X-100 was modified again with an upgraded air conditioning system, an openable rear-door window, and structural enhancement to the rear deck.
 Despite successive presidential state cars being built and delivered to the White House, the X-100 continued to be occasionally used by Presidents Lyndon B. Johnson, Richard Nixon, Gerald Ford, and Jimmy Carter until it was retired from service in early 1977.
As of 2016, it was publicly exhibited at The Henry Ford museum in Dearborn, Michigan.

President Johnson preferred white convertibles, but "concerns for protocol and safety" had him receiving a 1967 Lincoln Continental as his state car.
 The black hardtop cost the Ford Motor Company about $500,000 (equivalent to about $3,830,000 in 2019); they in turn leased it to the federal government for $1 (equivalent to $7.67 in 2019) per year.
 With 4,000 pounds (1,800 kg) of armor, "a bubble top thicker than the protective cockpit of an F-16 fighter", and a 340-horsepower (250 kW) V8 engine, the 11,000-pound (5,000 kg) car could still reach speeds of 100 miles per hour (160 km/h) — or 50 miles per hour (80 km/h) with four flat tires.
 The car served Presidents Nixon, Ford, and Carter, and traveled to 32 nations before it was retired in the mid-to-late 1970s.
 In 1996, Ford Motor restored the car to its original state and donated it to the Richard Nixon Presidential Library and Museum; the auto manufacturer chose Nixon's library because he took the car on several of his most-significant presidential trips.
In 1961, President John F. Kennedy accepted a modified, dark blue, 1961 Lincoln Continental that cost almost $200,000 (equivalent to about $1,700,000 in 2019).  Assigned the Secret Service code name of X-100, it was the most sophisticated presidential state car yet built.  The car included a "heavy-duty heater and air conditioner, a pair of radiotelephones, a fire extinguisher, a first-aid kit, and a siren."  The exterior featured improved, retractable standing platforms and handles for Secret Service agents, and flashing red lights recessed into the bumper.  Unique to the X-100 were three sets of removable roofs (a standard soft top, a lightweight metal one, and a transparent plastic one) and a hydraulic lift that raised the rear cushion 10 ¹⁄₂ inches (270 mm) off the floor.  Both of these feature sets were designed to make the president more visible to the public, but they also increased the president's vulnerability (e.g. the assassination of John F. Kennedy).  After the assassination, the X-100 was redesigned for an estimated cost of $500,000; the car was painted black and featured "improved telecommunications gear, a more powerful engine and flat-proof tires made of rubber-coated aluminum."  The fuel tank was protected against explosion by a "porous foam matrix" that minimized spillage in the event of a puncture.  The passenger compartment was protected by 1,600 pounds (730 kg) of armor, and the three removable roofs were replaced by a fixed glass enclosure that cost more than $125,000.  The glass enclosure was made of 13 different pieces of bulletproof glass ranging in thickness from 1 to 1 ¹³⁄₁₆ inches (25 to 46 mm), and was then the largest piece of curved bulletproof glass ever made.  In 1967, the X-100 was modified again with an upgraded air conditioning system, an openable rear-door window, and structural enhancement to the rear deck.  Despite successive presidential state cars being built and delivered to the White House, the X-100 continued to be occasionally used by Presidents Lyndon B. Johnson, Richard Nixon, Gerald Ford, and Jimmy Carter until it was retired from service in early 1977. As of 2016, it was publicly exhibited at The Henry Ford museum in Dearborn, Michigan.
President Johnson preferred white convertibles, but "concerns for protocol and safety" had him receiving a 1967 Lincoln Continental as his state car.  The black hardtop cost the Ford Motor Company about $500,000 (equivalent to about $3,830,000 in 2019); they in turn leased it to the federal government for $1 (equivalent to $7.67 in 2019) per year.  With 4,000 pounds (1,800 kg) of armor, "a bubble top thicker than the protective cockpit of an F-16 fighter", and a 340-horsepower (250 kW) V8 engine, the 11,000-pound (5,000 kg) car could still reach speeds of 100 miles per hour (160 km/h) — or 50 miles per hour (80 km/h) with four flat tires.  The car served Presidents Nixon, Ford, and Carter, and traveled to 32 nations before it was retired in the mid-to-late 1970s.  In 1996, Ford Motor restored the car to its original state and donated it to the Richard Nixon Presidential Library and Museum; the auto manufacturer chose Nixon's library because he took the car on several of his most-significant presidential trips.
Presidential state car (United States)