Ryanair Holdings Plc $RYAOF, Europe’s largest low-cost airline, has found itself at the center of a growing geopolitical and industrial debate after a senior U.S. lawmaker issued a stark warning over the potential purchase of Chinese-made aircraft. The cautionary statement came in response to comments from Ryanair’s CEO indicating the airline may consider sourcing jets from China’s COMAC if the pricing is favorable — especially if U.S. tariffs inflate the cost of current orders from Boeing Co. $BAX.