Ronaldsway Airport hopes to bring its air traffic controllers up to full strength by September.
A Freedom of Information request asked how many ATC staff are needed, how many are currently working and how many are being recruited.
The airport says it need 16 operators but currently only has 14 - another four are due to start this year.
Of the 14 currently working, only eight are available for operational duty.
The figures come after Ronaldsway said the runway closed five times a day for air traffic controller rest periods because of staff shortages.
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