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What are these blue lines around the runway at the airport chart that I marked with red line? - Aviation Stack Exchange
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Sometimes Bumpy Airport Upgrade on Final Approach at Reagan National | 2021-06-10 | Engineering News-Record
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Schematic representation of (a) monolayer produced by NDI-DCA in highly... | Download Scientific Diagram
![Sometimes Bumpy Airport Upgrade on Final Approach at Reagan National | 2021-06-10 | Engineering News-Record Sometimes Bumpy Airport Upgrade on Final Approach at Reagan National | 2021-06-10 | Engineering News-Record](https://www.enr.com/ext/resources/2021/06/10/DCA-checkpoint-aerial-June-2020_ENRready.jpg)
Sometimes Bumpy Airport Upgrade on Final Approach at Reagan National | 2021-06-10 | Engineering News-Record
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faa - What are the lines of triangles on the DCA RWY 19 River Visual approach chart? - Aviation Stack Exchange
![Sometimes Bumpy Airport Upgrade on Final Approach at Reagan National | 2021-06-10 | Engineering News-Record Sometimes Bumpy Airport Upgrade on Final Approach at Reagan National | 2021-06-10 | Engineering News-Record](https://www.enr.com/ext/resources/2021/06/10/1_DCA-Aerial-overview-July-2020_ENRready.jpg)