Vous avez cherché: aggregator (Anglais - Swahili)

to buy a ticket for an itinerary like this, you may have to contact the airline or use a lesser-known aggregator.
ili kununua tiketi ya safari kama hii, huenda ukalamizika kuwasiliana na ndege au utumie muuzaji asiyejulikana sana.

for instance, most aggregators are not selling tickets from china to the united states (presumably to avoid falling afoul of restrictions and being on the hook for a passenger's flight out).
kwa mfano, wauzaji hawauzi tiketi kutoka uchina hadi marekani (hiyo ni kwa sababu ya kuepuka kukiuka vikwazo na kushindwa kupata ndege ya abiria ya kutoka)