On 10 June 2021, an Embraer 170-200LR was cleared to line up and wait on runway 27 at San Diego with a Boeing 737-800 already cleared to land on the same runway. The occupied runway led to ASDE-X activation, which prompted a controller go-around instruction to the 737 when it was less than a mile from the runway's displaced threshold. However, this was blocked by an undetected simultaneous transmission from the B737. The 737 manoeuvred around the E170 that was vacating the runway as per the ATC instruction, before touching down beyond it.