From AOPA.ORG:

"The city of Allentown today announced that it will request that the FAA
change its Class C Airspace to be Class B airspace with the Queen City
Airport (1N9) as its core. They also announced that they will be building a
tower on the airport, and extending the 3950' runway to 6000'.
The announcement came on the heels of a sudden unexpected increase in volume
that has overwhelmed the moderately sized airport. When asked about the
reasons for the rush of airplanes headed to the airport, officials reported
they believed it to be due to an improving local economy and proximity to
tourist attractions such as Dorney Park. However, locals were overheard
rumbling about a local night club that has drawn attention of the pilot
community..."