` ` This is beginning to look very , very much like a hijacking , '' says Mr Porter . ` ` Mechanical problems are narrowing quickly , '' says former IT ##S managing director . ` Sometimes the transponder itself could be off frequency , not sending the right pulse . '' Transponders : ` ` They 're not supposed to work , but they do . ''
` ` This is beginning to look very , very much like a hijacking , '' says Mr Porter . ` ` Mechanical problems are narrowing quickly , '' says former IT ##S managing director . Transponders : ` ` They 're not supposed to work , but they do . ''