The free upgrades to Premium Economy are only available on certain trips, and must be booked before the end of November to qualify.

Tours eligible for the deal include the eight-day Taj Mahal, Delhi and Amber Fort programme and the 16-day Trans-American Adventure, which covers the US from east to west via road and rail qualifies.

All Leisure Holidays head of trade sales Sarah Weetman said: “At Travelsphere we always get a fantastic response from our agents when we put together such tactical offers as our latest flight upgrade offer with Virgin Atlantic.

“Being able to offer a customer something extra without adding to their holiday cost always works really well from our agents’ point of view.

“The US and India are two of our most popular destinations. We have 22 unique holidays across both countries and have put the upgrade offer on the most popular ones, in addition to one of our new tours for 2016, the Trans-American Adventure.

“For customers looking to take in a festival during their holiday, our Beyond the Golden Triangle departure on March 20 next year arrives in Agra in time to join in the Holi celebrations, also known as the festival of colours.”