Monday 19 May 16:30BST
Flightaware did not pick up the a flight plan and indeed cannot "see" the aircraft today.
However, as of now flightradar24 (which had not noticed the aircraft at all since it left Geneseo) says it is nearly at Iceland. I only found this out because I pressed the wrong button.
FindMeSpot tracker agrees.
Could be in Scotland tomorow.