Looks like my Raspberry Pi’ng days are coming to a close - at least for plane spotting. I recently replaced one Pi 2 with a Dell D530 laptop (running Ubuntu) that has a 120 gig SSD and 4 gigs of RAM. It runs Piaware, FR24, Planefinder and Adsbexchange - and never exceeds about 10% CPU load. My Pi’s on the other hand have always be problematic, no matter how well I maintain them. My last remaining ads-b Pi has developed an interesting foible today that I hadn’t seen before. Starting today, when I try to connect with ssh using Putty, not only does the ssh connection not complete, but the wifi signal dies briefly, like somehow the connection to the ssh port causes wifi to drop! I have decided not to rebuild it for ads-b but to use it for some other project. I have two Pi B+'s that run MotionEye, the security monitoring software. I have never had to replace the microsd card on either one of them. Anyway, just yakking here. No reflection on Pi’s. I love them. And I’m sticking with Piaware, etc., just devoting more serious hardware to this hobby. And waiting for FlightAware’s new surprise they promised us. 8)
I have a site running Dump1090-mutability and Piaware. It’s a 10 inch Netbook. Runs like a champ. It has Xubuntu on it. 
I have an old D610 that has outlasted a number of newer work laptops. It does duty today as my only headed Linux machine. I hope your 530 lasts as well as my 610; if so, you’ll get a lot of miles out of that box.
What’s the CPU on the D530?
It will give me a clue which of my old laptops might be suitable for similar - better than stuck in a cupboard unused Not had a problem with the RPi2 (yet) but I can repurpose that. A laptop is too big to hide.
Hmm and I’ve got an old Netbook too - was my mobile ADSB kit until a 10 inch tablet took over. Never seemed particularly quick but then again it was running Windows. 
Mine is a 10 inch ASUS netbook. It had Windows 7 starter on it. But I installed Xubuntu on it and runs good.