CBI sources said advocate Gautam Khaitan, Praveen Bakshi, CEO of Aeromatrix Infosolutions Pvt Limited and Pratap Aggarwal, Managing Director of IDS Infotech were also questioned separately.
They said Nanda who runs a travel business based in Connaught Place here had allegedly set up a shell company Media Exim in which Rs 6.5 crore were received from Michel between 2005-07.
The sources said the company was set up in 2005 ostensibly to export jewellery and music CDs but it is suspected that the funds received from Michel were allegedly used to purchase properties at Tony locations here.
Nanda's travel company Supreme Airways also received Rs 12 crore from Global Service FZE, which was Michael's company in Dubai, in 2012, which was allegedly used to purchase tickets for various influential people including some former Indian Air Force officials.
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CBI had registered a case against former IAF Chief S P Tyagi along with 13 others including his cousins, Bakshi, Aggarwal and European middlemen--Guido Haschke, Carlo Gerosa and Chritian Michel.
Tyagi has denied allegations against him and said the change of specifications, which brought AgustaWestland into contention, was a collective decision in which senior officers of Indian Air Force, SPG and other departments were involved.