Hi Katy,
So for the America's Heart & Soul - Chicago to New Orleans trip, the provisional flight times are listed as depart London 09:55hrs, arrive London 11:30hrs. You are correct in that the flight to Chicago is direct. The return journey is currently listed as flying via Dallas. In terms of numbers for this holiday, there are currently 17 travellers booked 4 men and 13 women with ages from early-30s to mid-70s. This tour has been cleared to operate.
For the Pompeii trip, flying from Stansted, the flight time is currently listed as departing at 06:10 on a number of the departures - if you have a specific date in mind, please let me know and I will double check this for you.
I have just looked at the first date for the Mysteries of Mexico, Guatemala & Belize trip and this is listed as departing Gatwick 10:55hrs with British Airways.
As always I must stress, that with all flight information provided above, these are provisional, subject to change and final details would be provided in your final documents.
Kindest regards,
Julia