The largest pterosaurs have not been grounded yet

Recent scientific papers examine size of the largest flying reptiles and whether they could fly. With a 34 foot wingspan and weighing as much as a tiger--maybe.

Pteranodontoidea - Wikipedia

Largest ever flying creatures had longer necks than giraffes – we found out how these pterosaurs kept their heads up

Why did pterodactyls fly? - Quora

Mark P. Witton's Blog: New paper: walking with early pterosaurs

This big-headed pterosaur may have preferred walking over flying

On the trail of the totally integrated pterosaur: Trends in Ecology & Evolution

Fossil fragment reveals giant, toothy pterosaur

Pterosaurs Are Changing What We Know About Flight

Figure 5 from Were early pterosaurs inept terrestrial locomotors?

These Giant Dinosaurs Are Changing What We Know About Flight

Mother lode of pterosaur eggs discovered

azhdarchid, The Pterosaur Heresies

Pteranodon and beyond: the history of giant pterosaurs from 1870 onwards