By Simon Mullock A plan to float Etihad Airways on the stock exchange could be good news for Manchester City in their bid to beat the 115 Premier League charges hanging over the club. The arrangements concerning City’s long-standing sponsorship deal with Etihad forms a significant part of the allegations made against the reigning champions. German publication Der Spiegel claims that the Emirati airline was paying just £8million of their official £67.5million obligation to City – and that the rest was met by disguised equity funding from the club’s Abu Dhabi owners. That breaks financial regula…