The operational speed of the metro trains on the 23-km-long Airport Express Line (AEL) connecting New Delhi to Dwarka Sec-21 via IGI Airport has been increased from 100 KMPH to 110 KMPH from Thursday onwards, the DMRC said. The decision to increase the speed of the trains was taken after the Delhi Metro Rail Corporation (DMRC) received the mandatory approval from the Commissioner of Metro Rail Safety (CMRS), it said.