/usr/share/games/flightgear/Aircraft/c172p/WebPanel/bootstrap/bootstrap.min.css is in flightgear-phi 2016.4.2+dfsg1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/games/flightgear/Aircraft/c172p/WebPanel/bootstrap/../../../../../../javascript/bootstrap/css/bootstrap.min.css