Do you sell duty-free products on board?
ven-DE-te — stress on second syllable. Duty-free: DYOO-tee free — pronounced with Italian rhythm.
Ask cabin crew if you want to buy perfume, cigarettes, chocolates, or other items from the in-flight duty-free catalogue, usually available on international flights.
Vendete (do you sell) is the second-person plural (voi) of vendere (to sell) — addressing the crew as a group. Prodotti (products) from prodotto, singular. Duty-free is used as-is in Italian, functioning as an adjective. A bordo (on board).
Avete il catalogo dei prodotti?
Do you have the product catalogue?
Asks to see the catalogue before ordering — catalogo is the same word
Accettate carte di credito?
Do you accept credit cards?
Payment method — important to check as some carriers only accept cash on board
Posso pagare in euro?
Can I pay in euros?
Currency question — all Italian flights accept euros, some also accept dollars or pounds
Duty-free shopping is most worthwhile on non-EU international flights — within the EU, duty-free on intra-EU flights was abolished in 1999. Italian perfume brands like Acqua di Parma or Bvlgari are popular purchases.