Fans travelling to major sporting events this summer face potential disruption at Glasgow Airport , as workers consider industrial action in a dispute over pay. Aviation trade union Unite has warned of significant delays coinciding with the the Commonwealth Games , which are being held in Glasgow from 23 July to 2 August, and the World Cup. Unite announced that its ICTS central search members at Glasgow Airport are currently being balloted for strike action . This follows their rejection of what the union described as an "unacceptable" pay offer from the company. The ballot, which opened on 1 May, is set to close on 21 May. If successful, industrial action could commence during the peak summer holiday period. The Commonwealth Games are set to take place in Glasgow (PA) Sharon Graham , Unite general secretary, stated: "Unite has warned ICTS that our members at Glasgow airport deserve a better pay offer than what is currently on the table.…