Boeing Co (BA.N) is in “very serious conversations” with five customers about its new Maritime Surveillance Aircraft, a long-range spy plane based on Bombardier’s 605 business jet, an executive said on Tuesday. Robert Schoeffling, a senior manager with Boeing’s military aircraft division, said it was difficult to predict when the planemaker would receive a first order for the aircraft, but it was likely to happen in the next year or two. Schoeffling gave no names, but said the five potential customers were in the Asia-Pacific region, the Middle East and Europe.