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It’s combination of the vortices of the LERX-fuselage and the LERX-wing junctions. High alpha vortex lift is why it’s purposely put into a design and another reason why variations of the delta are the standard planform of fighter aerodynamics. Even non-deltas still tend to feature LERXs to get some delta-ish high alpha vortex lift. Think F-5, Hornet family, AV-8B, Kawasaki T-4……
