If strike were to occur, it would be the largest walkout in US history at a single private employer, costing company $170m a day

The Teamsters and the delivery giant UPS look set to return to the negotiating table next week as a strike deadline of 1 August approaches for 340,000 workers represented by the union who are seeking a new contract agreement.

On 5 July, contract negotiations broke down between the union and UPS as both sides were still apart on issues that include better starting pay for part-time workers, wage increases for full-time workers and more full-time roles.