The DGCA has extended the deadline for IndiGo to replace all 135 unmodified PW engines from January-31 to May-31, a statement issued by the aviation regulator said. On November-1, stating that "desperate measures" were required to "put things in order", the DGCA had told IndiGo to replace the PW engines in 97 A320neo aircraft "at all costs" by January-31 or they would be grounded.