Arranging and conducting of conferences, congresses, seminars, workshops, training courses, lectures, symposiums, colloquiums and conventions, in particular also on board of aircrafts, all of the foregoing in the fields of technology and economics; consultancy and information services relating to arranging, conducting and organisation of educational conferences, congresses, seminars, workshops, training courses, lectures, symposiums, colloquiums and conventions, in particular also on board of...