Consider, the static charge, i.e., da/dt = 0. Classically the static Coulomb field is still retarded or advanced restricted to the light cone. However, in his QED papers, Feynman refers to the Coulomb potential as "instantaneous" because the Fourier transform of the virtual photons of longitudinal and timelike polarizations that form it comes out in the non-delayed form of 1/K^2, where K is the 3-vector momentum of the virtual photon. The virtual photons that make the largest contribution to the static Coulomb force are spacelike outside the classical light cone. Feynman, in his Cal Tech lectures, has a classical formula that shows the tendency to cancel the delayed effect in the static case.