Three doctors have appeared at the Old Bailey via video link charged in connection with the suspected car bomb attempts in London and Glasgow.
A Jeep was driven into the doors of Glasgow airport on 30 June
Bilal Abdullah, 28, of Paisley, and Mohammed Asha, 27, of Newcastle-under-Lyme, are accused of conspiracy to cause explosions.
Sabeel Ahmed, 26, of Liverpool, is charged with holding information which could have prevented a terror act.
The men were remanded in custody. A plea hearing is due on 18 January.
A trial is expected to take place next autumn.
Mr Abdullah, an Iraqi doctor at the Royal Alexandra Hospital in Paisley, was arrested at Glasgow airport on 30 June after a Jeep was driven into the doors of the main terminal building.
Later that same day, Jordanian Dr Asha was arrested in Cheshire on the M6 motorway.
The previous day, police in central London found two cars laden with gas canisters and fuel.
Dr Ahmed, originally from India, worked at Halton Hospital in Runcorn, Cheshire. His brother Kafeel Ahmed, 27, died of burns after being injured in the Glasgow attack.