(Sharecast News) - Fastjet chief financial officer Michael Muller will step down from his post in March, after the company announced his resignation on Friday.According to a report from Reuters, the African carrier had recently been struggling to secure cash to continue operations and as a result, Muller has resigned effective immediately.The low-cost airline suspended all domestic flights within Tanzania until the end of January, due to issues with its aviation licence.It had warned that it could risk going into administration, close down or sell itself, as it was running short on cash to run.Muller's successor search was already underway, Reuters said.