This may yet be the most difficult challenge yet for Andretti; although it has proven to the FIA that it has merit on sporting, technical, and financial grounds, thrashing out a deal with FOM will be tough given that the existing 10 teams will put the championship under pressure.
After all, the existing teams have their own vested interests, and have been conspicuously cool to the prospect of any new entrants under the current anti-dilution fee set out by the Concorde Agreement.
