TITLE II COOPERATION WITH THE INTERNATIONAL CRIMINAL COURT
CHAPTER IV ARREST, TRANSFER, TRANSIT AND SURRENDER OF PERSONS TO THE COURT
SECTION IV TRANSIT
Article 20
Should an unscheduled landing occur on Belgian territory, a transit authorization may be required from the Court in accordance with article 89, paragraph 3(e) of the Statute. The person transported shall be detained in custody until the request for transit is received and the transit is effected. However, detention may not be extended beyond 96 hours from the unscheduled landing unless the request is received within that period of time.
Detention during transit
Unscheduled landing on territory of transit State
EDIT.