Air Tanzania Company Limited (ATCL) has been banned to operate any flight within and outside Tanzania, at the same time had its operations certificate revoked by Tanzania's aviation authorities.Reports from Tanzania Civil Aviation Authority (TCAA) said the embattled and loss- making national airline was not air-worth after a number of discrepancies and operational failures were discovered within ATCL management this month.Aviation authorities revoked ATCL's flying certificate on Tuesday this week (December 8) and forced the airline to ground its planes for an unknown period. It has been known that ATCL failed to meet the International Air Transport Association (IATA) flying standards and regulations after an inspection by IATA and TCAA aviation experts who jotted down more than 500 operational gaps within the airline.IATA wrote to Tanzania aviation authorities looking for indefinite suspension of ATCL's flying certificate until the time that the airline solves its operational problems.