U.S. aerospace giant Boeing is under 'continuous' cyber-attack but there has been no breach of its databases, a senior executive said on Friday, June 3.

The admission by Mr Dennis Muilenburg, the chief executive of Boeing Defense, Space and Security, comes as Japanese electronics giant Sony recovers from a series of online incursions while Google also said it has been hit, AFP reported.

“We, as are other global enterprises, are under a continuous state of cyber-attack and cyber-probing,” Mr Muilenburg said.

“We recognize the reality of global business today, is that cyber-attacks are part of business and we've been prepared for that so this is not a surprising environment to us,” he told a media briefing in Singapore.

Mr Muilenburg did not want to mention how often the attacks took place or the people behind it but said Boeing's investment to protect its systems from hackers has paid off.

“I can tell you that the defensive capabilities that we've built up are very effective, and give us confidence and our enterprise is secure because of that investment,” he said.