A SpiceJet plane undershot the runway while landing at the Guwahati airport on Friday following which DGCA grounded the two pilots operating the SG960 Bengaluru-Guwahati flight. "They (pilots) have been off-rostered. It (matter) is under investigation," said a DGCA official. Although the plane landed before the designated point on the runway, none of the passengers were affected, officials said.