There was a call for automated transponders after the terrorist attacks of 11 September 2001; no changes were made because aviation experts preferred flexible control, in case of malfunctions or electrical emergencies. In the aftermath of Flight 370's disappearance, the air transport industry was still resistant to the installation of automated transponders, which would likely entail significant costs. Pilots also criticised changes of this kind, insisting on the need to cut power to equipment in the event of a fire. Nonetheless, new types of tamper-proof circuit breakers were being considered.