The UK has suspended Iranian airline Mahan Air's operating permit on safety grounds, the Department for Transport (DfT) has said.
The DfT said Mahan had been involved in incidents which suggested a poor level of operational control and planning.
It also cited poor safety control, including some aircraft operating without collision avoidance systems.

Last month the airline increased the regularity of its flights from Tehran to Manchester to five times a week.
Mahan, whose network spans 21 destinations in 10 countries, is based in the Iranian capital.
"We'll work with EU and other partners to help Air Mahan to rectify any deficiencies, but we won't allow them to recommence operations until they have convinced us they can do it safely," the DoT said.
Head of Iran's Aviation Organization says the ban by the UK Department of Transport on flights of Iran's Mahan Airline can be removed soon.
Alireza Manzari noted that the IAO has held different sessions to resolve the prevailing row between aviation industries of two countries, Fars reported.
Referring to a letter by the Britain's Transport Department to Mahan Airline, he noted that the letter contains general issues and the airline is seriously studying the letter to help remove the existing problems.
Manzari pointed out that the letter has nothing to do with political issues and it has only focused on technical issues.
British Department of Transport announced earlier flights of Mahan Airline to UK were put on hold due to security reasons.
Mahan Airline had five regular weekly flights to Manchester and Birmingham.
Britain has suspended Iranian airline Mahan Air's operating permit on safety grounds, a Department of Transport spokesman said on Saturday.
In June, Mahan Air increased the regularity of its flights from Tehran to Manchester to five times a week.
"We suspended the operating permit of Mahan Air on Friday night as it's not able to operate safely," said a Department of Transport spokesman.
"It has been involved in a number of recent incidents which suggests a poor level of operational control, planning and safety management," he said.
"We'll with work with EU and other partners to help Air Mahan to rectify any deficiencies, but we won't allow them to recommence operations until they have convinced us they can do it safely."
The DfT said Mahan had been involved in incidents which suggested a poor level of operational control and planning.
It also cited poor safety control, including some aircraft operating without collision avoidance systems.

Last month the airline increased the regularity of its flights from Tehran to Manchester to five times a week.
Mahan, whose network spans 21 destinations in 10 countries, is based in the Iranian capital.
"We'll work with EU and other partners to help Air Mahan to rectify any deficiencies, but we won't allow them to recommence operations until they have convinced us they can do it safely," the DoT said.
Head of Iran's Aviation Organization says the ban by the UK Department of Transport on flights of Iran's Mahan Airline can be removed soon.
Alireza Manzari noted that the IAO has held different sessions to resolve the prevailing row between aviation industries of two countries, Fars reported.
Referring to a letter by the Britain's Transport Department to Mahan Airline, he noted that the letter contains general issues and the airline is seriously studying the letter to help remove the existing problems.
Manzari pointed out that the letter has nothing to do with political issues and it has only focused on technical issues.
British Department of Transport announced earlier flights of Mahan Airline to UK were put on hold due to security reasons.
Mahan Airline had five regular weekly flights to Manchester and Birmingham.
Britain has suspended Iranian airline Mahan Air's operating permit on safety grounds, a Department of Transport spokesman said on Saturday.
In June, Mahan Air increased the regularity of its flights from Tehran to Manchester to five times a week.
"We suspended the operating permit of Mahan Air on Friday night as it's not able to operate safely," said a Department of Transport spokesman.
"It has been involved in a number of recent incidents which suggests a poor level of operational control, planning and safety management," he said.
"We'll with work with EU and other partners to help Air Mahan to rectify any deficiencies, but we won't allow them to recommence operations until they have convinced us they can do it safely."

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