We used to operate connecting services for SN from BJM to KGL and EBB with Let 410s. SN demanded a one-way ticketing agreement at seriously reduced rates; demanded that their pax be allowed to carry two suitcases/40kgs (a major poblem on a 17 seater Let 410 - it meant that we had to take out two revenue seats for starters); and refused us so much as a single rebate ticket for senior staff. To add insult to injury, we had a weekly courier flying BRU-EBB-BRU carrying VAL shipments and on average once a month he'd find his reservation had miraculously disappeared from M class ... but he could upgrade to Y - after paying the difference, of course!
We very seriously looked at using BA instead - and if it hadn't been for the hassle at LGW to tranship the VAL we'd have used them and sod SN.
As it was, we pulled the KGL services and one of the EBB runs - that started SN squawking, as they had to pay for overnight accommodation for their connecting pax!
Awful organisation, staffed primarily by Jobsworths.