Many aeroplane cockpits have cup holders.

(Pilots are allowed to have beverages in the cockpit. Unfortunately this factlet came to light in 2011 when a pilot spilled coffee on the cockpit panel of a Boeing 777-200 headed from Chicago to Frankfurt, leading to a false hijack warning and culminating in the plane’s emergency landing in Canada. I guess they’ve got to keep hydrated, but they should give them sippy cups.)