Visa and the Singapore Tourism Board sign a three-year MOU, bringing Visa Destinations to Singapore from November. The Singapore Tourism Board has signed an initial pact with domestic carrier IndiGo to boost tourism and travel between the two countries, a statement said on Tuesday. IndiGo and Singapore Tourism Board (STB) signed a year-long memorandum of understanding (MoU) to promote Singapore as a leading leisure and business destination for Indian travellers and.