British holidaymakers could be facing delays and cancellations caused by Boeing aircraft shortages following a number of safety concerns. The world’s largest aircraft leasing company Avia Solutions has warned that air carriers searching for planes will likely have to cancel routes and reduce their summer service. It comes after questions about safety have surrounded the aircraft manufacturer ever since a door plug blew out of a 737 Max on an Alaska Airlines flight in January. In March, a wheel fell off a Boeing 777-200 shortly after take off from San Francisco, crushing cars below. No one was …