System Underrun Limitation (SUL) Summary 2019 - 2021 May 2021 Area Called No SUL was called for May 2021   April 2021 Area Called No SUL was called for April 2021   March 2021 Area Called No SUL was called for March 2021   February 2021 Area Called No SUL was called for February 2021   January 2021 Area Called No SUL was called for January 2021   December 2020 Area Called No SUL was called for December 2020   November 2020 Area Called No SUL was called for November 2020   October 2020 Area Called No SUL was called for October 2020   September 2020 Area Called No SUL was called for September 2020   August 2020 Area Called No SUL was called for August 2020   July 2020 Area Called No SUL was called for July 2020   June 2020 Area Called No SUL was called for June 2020   May 2020 Area Called No SUL was called for May 2020   April 2020 Area Called No SUL was called for April 2020   March 2020 Area Called No SUL was called for March 2020   February 2020 Area Called No SUL was called for February 2020   January 2020 Area Called No SUL was called for January 2020   December 2019 Area Called No SUL was called for December 2019   November 2019 Area Called No SUL was called for November 2019   October 2019 Area Called No SUL was called for October 2019   September 2019 Area Called No SUL was called for September 2019   August 2019 Area Called No SUL was called for August 2019   July 2019 Area Called No SUL was called for July 2019   June 2019 Area Called No SUL was called for June 2019   May 2019 Area Called No SUL was called for May 2019   April 2019 Area Called No SUL was called for April 2019   March 2019 Area Called No SUL was called for March 2019   February 2019 Area Called No SUL was called for February 2019   January 2019 Area Called No SUL was called for January 2019