Omicron-induced staff shortages led to thousands of flights cancellations over the Christmas weekend in the US
Brent crude futures rose 85 cents, or 1.2%, to $69.72 by 0402 GMT, having eased 0.5% in the previous session
The fall came after UN climate talks ended Saturday with a deal that for the first time targeted fossil fuels
Brent crude futures fell 58 cents, or 0.7%, to $81.59 a barrel, as of 0151 GMT. U.S. West Texas Intermediate (WTI) crude lost 58 cents, or 0.7%, to $80.21 a barrel
Brent crude was down 2 cents at $83.41 a barrel by 0735 GMT, after gaining 0.8% on Monday
Biden blames higher oil and gas prices on OPEC; EIA shows bigger than expected jump in crude inventories
Investors with a high risk tolerance can still add exposure to longer-dated Brent oil contracts
Brent is set for a sixth straight weekly gain in the wake of robust demand and limited supply
"Oil prices are likely to continue climbing in the short term," said Commerzbank analyst Carsten Fritsch
In a recent report, analysts at Goldman Sachs suggested they see Brent crude oil prices at $90 per barrel by December 2021 on the back of a larger-than-expected demand-supply deficit
Brent crude up nearly 20% in the past month and hit a 3-yr high on Tuesday
In the last one week alone, Brent crude oil prices have surged over 6 per cent to around $79 per barrel mark
Even with Covid concerns creating recent jitters in big consumers like China and US, the impact appears to be diminishing as the global economy recovers
OPEC and its allies will likely stick to their existing policy of gradual oil output increases, four sources said on Wednesday, even though the group revised up its 2022 demand outlook
Oil rose on expectation of a continuous decline in US oil inventories, recouping some losses from the previous session due to concern over rising cases of Delta Covid variant.
China's factory activity growth slipped sharply in July as demand contracted for the first time in more than a year
Oil prices fell on Monday on worries over China's economy after a survey showed growth in factory activity slipped sharply in the world's second-largest oil consumer
OPEC and its allies on Friday voted to increase production by about 2 million barrels a day from August to December 2021 extend the remaining output cuts to the end of 2022
The recovery in key energy consumers including the U.S. and China has helped underpin a surge in fuel demand and driven prices to the highest level since October 2018.
Brent crude futures were up 32 cents, or 0.3%, at $72.42 a barrel at 0911 GMT