Brent crude was down 33 cents or 0.8 per cent at $42.82 a barrel by 0645 GMT, while U.S. crude was down 38 cents or 0.9 per cent to $40.73 a barrel.
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Oil reports correlation expert says Brent races to $100 in spite of despicable manipulations
Brent crude was up 50 cents at $75.58 a barrel by 1335 GMT.
International Air Transport Association Chief Executive Alexandre de Juniac said his organisation will issue fresh forecasts next week, and that airline profits were still likely to be robust.
Brent crude futures rose to settle at $68.65 a barrel.
Investors covered short bets ahead of a weekend in which the US news programme “60 Minutes” will air an interview with Saudi Arabia’s crown prince
“With strong compliance to OPEC’s production curbs already supporting prices, comments from the Saudi Arabian Crown Prince that suggested the production cut agreement should be extended added to gains,” ANZ bank said on Monday
Brent crude futures, the international benchmark for oil prices, were at $57.85
Earlier in the week on Monday, Brent rose to $65