<span style="color: #222222;">A Delhi court today extended till August 23 the interim protection from arrest granted to former Union minister P Chidambaram and his son Karti in Aircel-Maxis cases filed by the CBI and the ED.<br />''<br />''Special Judge O P Saini extended the relief, which was to end today, saying the court was not available for arguments.<br />''<br />''The cases relate to alleged irregularities in the grant of Foreign Investment Promotion Board approval in the Aircel-Maxis deal.</span><br />