Plane delivers air mail to Philadelphia, PA, in 1918

On May 15th, 1918, pilot Louis Webb of the Aviation section of the Signal Core experienced a crash landing. The mail had to be returned, and a second flight was attempted the next day. Three hours and 20 minutes later, Webb successfully landed in North Philadelphia, where he was greeted by a cheering crowd and a little girl who presented him with flowers.

What date did Louis Webb encounter trouble during his flight?

What was the reason for Louis Webb's crash landing?

What happened to the mail after the crash landing?

How long after the first attempt did Louis Webb successfully land on his second try?

Who greeted Louis Webb upon his successful landing?