evidence: A sum of over Rs 642 crore has been incurred on Prime Minister Manmohan Singh's air travels abroad in the last nine years. [...] The information reveals that Dr Singh undertook 67 trips since 2004 when he took over as Prime Minister. Of these, five bills have not yet been submitted. The bills received from the rest show that Rs 642.45 crore was spent on air travel. [...] The list of the Singh's visits shows maximum expenditure of Rs 26.94 crore was incurred on his seven-day long visit to Mexico and Brazil in 2012 to attend G20 Summit and Rio+20 Summit respectively.