F-35 variants. Does B stand for budget? Is it simply a lower cost

Air Force to upgrade F-35A gas tanks to weather lightning strikes

Why the F-35 Is Such a Badass Plane: F-35 Fighter Jet History

XFV-12A: In the 1970s Rockwell attempted to develop a VTOL fighter

UK industry officials raise eyebrows over Royal Air Force F-35, E-7 and A400M programs - Breaking Defense

The ten most expensive military aircraft ever built

Lockheed Martin F-35 Lightning II - Wikipedia

Inside America's Dysfunctional Trillion-Dollar Fighter-Jet Program - The New York Times

Lockheed backs new AETP engine for F-35 - Breaking Defense

F-35 Lightning II Joint Strike Fighter (JSF)

The Air Force admits the F-35 fighter jet costs too much. So it wants to spend even more.

XFV-12A: In the 1970s Rockwell attempted to develop a VTOL fighter

Why is the F-35A so much cheaper than the other two variants? - Quora