LONDON (AP) — Britain's Met Office says a dense ash cloud from an Icelandic volcano could hit Scotland and disrupt flights as early as Monday night.

Spokesman David Britton said an ash cloud classifed as high-density is expected to cover parts of Scotland by 6 a.m. local time (0500 GMT; midnight EDT) Tuesday.
Britain's Civil Aviation Authority said Monday that aircraft cannot fly through high-density ash clouds, though they may be able to fly through lower-density clouds.