IIRC Highland Express with their 747 G-HIHO was the first ''scheduled'' Transatlantic carrier from STN to EWR in June 1987
The flight went through PIK to EWR (soon after also operated to EWR from BHX via PIK, and then for 3 weeks from LGW too, then they collapsed)
They had traffic rights on the STN-PIK leg tickets were sold at £19 o/w which made them the first LCC to ever operate from STN within the UK
(The Company lasted until Nov 1987 - less than 6 months)