CBI sources said the MP was questioned in the afternoon for nearly 90 minutes.
Bandopadhyay later said he was satisfied with the way he was questioned and described CBI as the "civilised bureau of investigation".
"They were very cordial and did not trouble me at all. They asked various questions for nearly one and a half hour. But I cannot reveal details. I must say agency is civilised bureau of investigation," he told reporters.
CBI has alleged that Bandopadhyay had presented four tickets worth Rs 1.28 lakh whereas actual payment of Rs 2,000 was made to Air India thus making a gain for Rs 1.26 lakh for himself on the inflated bills.
The agency has registered cases against three sitting MPs --Bandopadhyay, Brajesh Pathak of BSP and Lalhming Liana of Mizo National Front and three former Rajya Sabha members JPN Singh (BJP), Mahmood A Madani (Rashtriya Lok Dal) and Renu Pradhan (Biju Janata Dal) in connection with the case.
The agency claimed to have detected some more instances of alleged criminality during scrutiny of documents recovered during the first case registered in this connection on November 1 last year.
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