Privacy lawyer Gerald Shamash has told the Guardian that the allegations a Virgin Atlantic employee passed on information about eight celebrities is "extremely worrying" and "this could be the tip of the iceberg".
Mr Shamash also said advance knowledge of the whereabouts of celebrities was the "bread and butter" of life as a picture agency or tabloid newspaper.
"Once it has these details, the agency does one or two things: it keeps [the information] to sell it or phones a newspaper to say this person has gone to Los Angeles. It's a symbiotic relationship with newspapers."
More top news
Scientists have discovered the oldest known earth-size planets discovered which they say raises the prospect of 'ancient life'.
Auschwitz survivor Alina Dabrowska was a victim of the cruel experiments of Nazi doctor Josef Mengele, known as "the Angel of Death."
Here are just some of the faces and stories of Auschwitz survivors 70 years on from the concentration camp's liberation.