The busiest April on record was reported by Glasgow airport with more than 786,000 passengers.
The 8.9% rise on the same month last year included an 18% increase in international traffic.
The airport was boosted by the Easter getaway with almost 110,000 passengers travelling during the first weekend of the school holidays.
Strong demand was seen for European destinations including new Ryanair services to Valencia, Lisbon and the Lithuanian city of Palanga.
April marked the start of the busy summer season with a number of airlines including Jet2 and Thomas Cook adding extra capacity.
Managing director, Amanda McMillan, said: “In addition to growing our European network we have been working hard to consolidate our long haul offering.
“Both American Airlines and WestJet will return later this month and we also welcome Delta Air Lines to Glasgow for the first time when its inaugural service to New York-JFK takes off on May 26.
“Not only do these routes play a hugely important role in strengthening our links with North America they will also help generate significant inbound tourism for Glasgow and Scotland, particularly at a time when the current exchange rate favours the US Dollar.
“Earlier this month Loganair launched our first ever direct service to Bergen, Norway, and with new flights to Frankfurt and Madrid still to come we are continuing to provide passengers with a greater choice of business and leisure destinations.”