Security at all UK airports has been tightened and
flights cancelled, resulting in long delays and fears that the problems
will hurt businesses.
The FTSE 100 fell more than 1% with shares in British Airways down 5%.
Analysts said that the costs to business and companies would depend on how quickly normal services resumed.
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I think it would be better to write the last sentence of the above as follows:
Analysts said that the costs to business and companies would depend on how quickly normal services will resume.
This is some prediction. So the words 'will resume' is correct.
Your comments, please.