OBS_VALUE: <ul><li><a href=https://www.caas.gov.sg/docs/default-source/pdf/gen_1-255f2debb3903666590f0ff000087c682.pdf target=_blank>Gen 1.2 Entry, Transit And Departure Of Aircraft(AIP Singapore GEN 1.2-112 NOV 2015. Gen 1.2 Entry, Transit And Departure Of Aircraft)</a></li><li><a href=https://www.caas.gov.sg/docs/default-source/pdf/2-13.pdf target=_blank>Slot Application Requirements For All Non-Scheduled,Commercial And Non-Commercial, Flight OperationsAt Singapore Changi Airport(Republic Of Singapore Aeronautical Information ServicesCivil Aviation Authority Of Singapore Singapore Changi Airport P.O. Box 1, Singapore 918141. Circular 2/13 issued on 12 April 2013.Slot Application Requirements For All Non-Scheduled,Commercial And Non-Commercial, Flight OperationsAt Singapore Changi Airport. Section 3.2)</a></li><li><a href=https://www.changiairport.com/content/dam/cag/footer/conditions-of-use/CAG%20Conditions%20of%20Use%202017.pdf target=_blank>Changi Airport Group (Singapore) Pte LtdConditions of Use 2017(Changi Airport Group (Singapore) Pte LtdConditions of Use 2017 - Specific condition of use. Section 1 - airport slots. )</a></li></ul>