There have been three first flights during the period of Expo 58 (14 April - 19 October 1958).

Moscow, 2 June

The first flight was the flight Brussels-Moscow on 2 June 1958.
Plane was a DC.7 C 00-SFG - Board supervisor is VAN DER VERREN

Only the Rodan cover was also cancelled with the Expo 58 cancel.

Official FFC cover from Rodan

Official FFC cover from Grumiaux

Sabena card

Private letter from Eupen

Nice cover with double cancellation with United Nations on 1st of June

Poznan, 6 June

The flight to Poznan from Brussels was a special flight service from Sabena only for that day of 6 June. It was put in place for the special exhibitionat Poznan in Poland.
Plane was a DC.6 C 00-SDC - Board supervisor is J. MOREAU

Private card

Budapest, 21 August

The flight from Budapest - Hungary to Brussels is special foreseen for Expo 58. No information over the flight found.

Private card

The following card is flight card cancelled on 3 September via UN, sent to Budapest via flight Leipzig BPA 32. The card came back to Brussels from Budapest, special first flight cancellation Budapest-Brussels dated somewhere in September, day unreadable.