  The frame dependence of the pair-term contribution to the electromagnetic
form factor of the pion is studied within the Light Front approach. A symmetric
ansatz for the pion Bethe-Salpeter amplitude with a pseudo scalar coupling of
the constituent to the pion field is used.
  In this model, the pair term vanishes for the Drell-Yan condition, while it
is dominant for momentum transfer along the light-front direction.
