Aircraft glitching at high speeds or low FPS

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I had the same issue, personally found using a physics substep algorithm did the trick to stabilize more at lower fps:

Got the idea from also a unity tutorial on aircraft haha:

--Calculate force normal, used in vector forces
        local upwardForce = calculateForces(targetHeight, currentHeight, currentYVelocity, t, mass, hipHeight, dt)

        local function physicsSubstep(substepUpwardForce, step, substepYVelocity, iterateHeight)
            local netForce = substepUpwardForce  - weight

            local predictedVelocity = predictVelocity(netForce, mass, substepYVelocity, step)
            local predictedDisplacement = predictDisplacement(netForce, mass, substepYVelocity, step)

            local newUpwardForce = calculateForces(targetHeight, iterateHeight+predictedDisplacement, predictedVelocity, t, mass, hipHeight, dt)
            local averageVelocity = (substepYVelocity+predictedVelocity) * 0.5
            local averageForce = (newUpwardForce+ substepUpwardForce)*0.5
            local averageHeight = iterateHeight+predictedDisplacement*0.5

            return averageForce, averageVelocity, averageHeight
        end

        --Perform physics substep
        local iterateForce = upwardForce
        local iterateYVelocity = currentYVelocity
        local iterateHeight = currentHeight
        local n = 3 --Split a frame into multipe "Substep" frames
        local step = dt/n
        for _ = 1, n-1 do
            iterateForce, iterateYVelocity, iterateHeight = physicsSubstep(iterateForce, step, iterateYVelocity, iterateHeight)
        end
        upwardForce = iterateForce

Scenario for stiff spring suspension on a custom character:

Before:

After:

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