Everyone wasting time chasing Trump chemtrails due to this image you are wasting your time.
The photo was taken February 2017 when Trump visited the Boeing plant in Charleston, SC to see the rollout of the very first 787-10 Dreamliner.
The tanks are water ballast tanks used to add simulated passenger weight during flight testing and they are removed and replaced with passenger seating prior to delivery.
https: //www.postandcourier.com/business/president-trump-boeing-s—dreamliner-a-celebration-of/article_52e4b928-f54f-11e6-8ca7-af25a2ea9487.html
http: //compositesmanufacturingmagazine.com/2017/02/boeing-debuts-787-10-dreamliner-trump-visit/
https: //www.usatoday.com/story/travel/flights/todayinthesky/2017/03/31/boeings-new-787-10-dreamliner-completes-its-maiden-flight/99877056/