In a communication to AAP's Karnataka Convenor Prithvi Reddy, he said, "I would like to resign from the membership of the Aam Admi Party with immediate effect because of increasing differences with the party leadership and its ways."
Gopinath, who joined AAP in January this year, said he had "expressed most of my views also in the media including today" and wished "the party well in its future endeavours".
He had founded the first low-cost carrier Air Deccan in 2003, which was taken over by Vijay Mallya and named 'Kingfisher Red' that has now closed down.
In a blog titled 'Has Kejriwal lost his way' today, he criticised the functioning of AAP chief.
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"It's one thing to gossip about it in private but when one holds a responsible position as head of a political party, one has to take responsibility and not, as some one described it, indulge in shoot and scoot politics, denigrating people's reputation, however credible the rumours may seem and however tempting the chance to score brownie points or capture media attention and public sympathy as a crusader against corruption," Gopinath said in the blog.