yorkshire

I've not been to the Yorkshire Air Museum.

I'm assuming you are taking transit from York to Whitby. That route- The Yorkshire Coastliner 840

is often voted the most scenic bus ride in Britain. It runs every 2 hours. If you go before the end of June the route is covered by the government fare cap so will cost only £2 each way.
A great day out.
It is possible on the way back to get a bus down the coast to Sacrborough, then train or bus back to York, or a bus across the North York Moors to Middlesborough- another wonderful route- then train to York.
But let's keep it simple, and just do York to Whitby return.

The Yorkshire Air Museum is not in Whitby. It's just outside of York in Elvington.

There is direct bus service from York. It takes about 40 minutes.

https://www.yorkpullmanbus.co.uk/local-bus/route-36

The Yorkshire Maze is an attraction I haven't heard of before, which I see is near the Air Museum, but is only open during the 6 week Summer school holidays.

I assumed the OP was aware that the Air Museum was nowhere near Whitby, and was asking about 2 separate possible trips, as he used the plural word trips.

I should also qualify that the attached Coastliner timetable is the summer one from 2 April 2023.

he Yorkshire Air Museum is on my todo list.... It gets consistently good reviews on Trip Advisor. ''Have you come across Eden Camp, on the outskirts of Malton. That is another excellent day out.

Possibilities might include, Kirkstall Abbey, Fountains Abbey, Thirsk (think, All Creatures Great and Small), Eden Camp Modern History Museum, Brimham Rocks, The Twelve Apostles Stone Circle, Ilkley Moor Cow & Calf Rocks, and Harrogate. There are plenty of options. How you’re getting around will make a difference in travel plans.

Elvington has the World's only complete/extant HP Halifax (one of the big three heavy bombers the RAF used in WWII) and worth a visit for that alone.

Elvington is south of York and in the other direction and some distance from Whitby and not really conducive for a same day visit. What one could do on the same day is the York Cold War bunker which is an absloutely fascinating visit. That is a short distance north of York so would need a bit a planning, but doable on the same day.

https://www.english-heritage.org.uk/visit/places/york-cold-war-bunker/

Continuing the military theme there’s also the York Army museum or a day trip to the Royal Armouries in Leeds.

Other non military options are also available