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

Canada Agrees to Buy the F-35 As Its Next Fighter Jet, Yet Again

$30 Billion F-35 Deal Will See Prices Rise, Deliveries Dip

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Hammer from the Clouds: The B-37 'King Widow' Strategic Bomber : r

UK appears to recommit to full order of 138 F-35Bs