Qantas says its fuel bill could be $600 million to $800 million higher than expected because of the ongoing energy crisis - and it plans to reduce capacity to help offset some of those costs.

Virgin has also flagged fare changes as it responds to higher costs. 

So how badly could this hit travellers in the months ahead - and how is the conflict involving the US, Israel, and Iran affecting the price of jet fuel?

Carrington Clarke and Ian Verrender help you stay on top of the numbers behind the ongoing energy crisis on Fuelcast on ABC Business Daily.

When fuel and energy prices move, Fuelcast helps you understand why. Hosted by Carrington Clarke, Alan Kohler, and Ian Verrender, it brings you the latest numbers, the big developments driving the energy story, and what they could mean for households, business, and the broader economy. New episodes drop every Monday, Wednesday, and Friday in the ABC Business Daily feed, alongside ABC Business Daily and That’s Business with Alan Kohler.

Got a burning brent crude question?

Send an email to Carrington and the team abcbusinessdaily@abc.net.au